All: Support for plural translations (#9033)

2025-10-31 00:07:48 +02:00 · 2023-10-11 12:17:46 +03:00
parent a98c323bf3
commit 0402fa624d
10 changed files with 213 additions and 54 deletions
--- a/.eslintignore
+++ b/.eslintignore
@@ -955,6 +955,7 @@ packages/renderer/noteStyle.js
 packages/renderer/pathUtils.js
 packages/renderer/utils.js
 packages/tools/build-release-stats.js
+packages/tools/build-translation.js
 packages/tools/build-welcome.js
 packages/tools/buildServerDocker.test.js
 packages/tools/buildServerDocker.js
--- a/.gitignore
+++ b/.gitignore
@@ -941,6 +941,7 @@ packages/renderer/noteStyle.js
 packages/renderer/pathUtils.js
 packages/renderer/utils.js
 packages/tools/build-release-stats.js
+packages/tools/build-translation.js
 packages/tools/build-welcome.js
 packages/tools/buildServerDocker.test.js
 packages/tools/buildServerDocker.js
--- a/packages/lib/locale.test.ts
+++ b/packages/lib/locale.test.ts
@@ -1,4 +1,4 @@
-import { closestSupportedLocale } from './locale';
+import { closestSupportedLocale, parsePluralForm, setLocale, _n } from './locale';

 describe('locale', () => {

@@ -15,4 +15,80 @@ describe('locale', () => {
 		}
 	});

+	it('should translate plurals - en_GB', () => {
+		setLocale('en_GB');
+		expect(_n('Copy Shareable Link', 'Copy Shareable Links', 1)).toBe('Copy Shareable Link');
+		expect(_n('Copy Shareable Link', 'Copy Shareable Links', 2)).toBe('Copy Shareable Links');
+	});
+
+	it('should translate plurals - fr_FR', () => {
+		setLocale('fr_FR');
+		expect(_n('Copy Shareable Link', 'Copy Shareable Links', 1)).toBe('Copier lien partageable');
+		expect(_n('Copy Shareable Link', 'Copy Shareable Links', 2)).toBe('Copier liens partageables');
+	});
+
+	it('should translate plurals - pl_PL', () => {
+		setLocale('pl_PL');
+		// Not the best test since 5 is the same as 2, but it's all I could find
+		expect(_n('Copy Shareable Link', 'Copy Shareable Links', 1)).toBe('Kopiuj udostępnialny link');
+		expect(_n('Copy Shareable Link', 'Copy Shareable Links', 2)).toBe('Kopiuj udostępnialne linki');
+		expect(_n('Copy Shareable Link', 'Copy Shareable Links', 5)).toBe('Kopiuj udostępnialne linki');
+	});
+
+	it('should parse the plural form', async () => {
+		const pluralForms = [
+			'nplurals=1; plural=0;',
+			'nplurals=2; plural=(n != 0);',
+			'nplurals=2; plural=(n != 1);',
+			'nplurals=2; plural=(n > 1);',
+			'nplurals=2; plural=(n%10!=1 || n%100==11);',
+			'nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n != 0 ? 1 : 2);',
+			'nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && (n%100<10 || n%100>=20) ? 1 : 2);',
+			'nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2);',
+			'nplurals=3; plural=(n==0 ? 0 : n==1 ? 1 : 2);',
+			'nplurals=3; plural=(n==1 ? 0 : (n==0 || (n%100 > 0 && n%100 < 20)) ? 1 : 2);',
+			'nplurals=3; plural=(n==1 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2);',
+			'nplurals=3; plural=(n==1) ? 0 : (n>=2 && n<=4) ? 1 : 2;',
+			'nplurals=3; plural=(n==1) ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2;',
+			'nplurals=4; plural=(n%100==1 ? 1 : n%100==2 ? 2 : n%100==3 || n%100==4 ? 3 : 0);',
+			'nplurals=4; plural=(n==1 ? 0 : n==0 || ( n%100>1 && n%100<11) ? 1 : (n%100>10 && n%100<20 ) ? 2 : 3);',
+			'nplurals=4; plural=(n==1 || n==11) ? 0 : (n==2 || n==12) ? 1 : (n > 2 && n < 20) ? 2 : 3;',
+			'nplurals=4; plural=(n==1) ? 0 : (n==2) ? 1 : (n != 8 && n != 11) ? 2 : 3;',
+			'nplurals=4; plural=(n==1) ? 0 : (n==2) ? 1 : (n == 3) ? 2 : 3;',
+			'nplurals=5; plural=n==1 ? 0 : n==2 ? 1 : (n>2 && n<7) ? 2 :(n>6 && n<11) ? 3 : 4;',
+			'nplurals=6; plural=(n==0 ? 0 : n==1 ? 1 : n==2 ? 2 : n%100>=3 && n%100<=10 ? 3 : n%100>=11 ? 4 : 5);',
+		];
+
+		const pluralValues = [
+			[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+			[0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+			[1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+			[0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+			[1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1],
+			[2, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1],
+			[2, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 1, 1, 1],
+			[2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 1, 1, 1, 2, 2, 2],
+			[0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2],
+			[1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2],
+			[2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2],
+			[2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2],
+			[2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2],
+			[0, 1, 2, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+			[1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3],
+			[3, 0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 0, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3],
+			[2, 0, 1, 2, 2, 2, 2, 2, 3, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2],
+			[3, 0, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3],
+			[4, 0, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4],
+			[0, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4],
+		];
+
+		for (let index = 0; index < pluralForms.length; index++) {
+			const form = pluralForms[index];
+			const pluralFn = parsePluralForm(form);
+			for (let i = 0; i < 128; ++i) {
+				expect(pluralValues[index][i]).toBe(pluralFn(i));
+			}
+		}
+	});
+
 });
--- a/packages/lib/locale.ts
+++ b/packages/lib/locale.ts
@@ -7,6 +7,7 @@ interface StringToStringMap {
 interface CodeToCountryMap {
 	[key: string]: string[];
 }
+type ParsePluralFormFunction = (n: number)=> number;

 const codeToLanguageE_: StringToStringMap = {};
 codeToLanguageE_['aa'] = 'Afar';
@@ -436,12 +437,51 @@ const codeToCountry_: CodeToCountryMap = {
 let supportedLocales_: any = null;
 let localeStats_: any = null;

-const loadedLocales_: any = {};
+const loadedLocales_: Record<string, Record<string, string[]>> = {};
+
+const pluralFunctions_: Record<string, ParsePluralFormFunction> = {};

 const defaultLocale_ = 'en_GB';

 let currentLocale_ = defaultLocale_;

+// Copied from https://github.com/eugeny-dementev/parse-gettext-plural-form
+// along with the tests
+export const parsePluralForm = (form: string): ParsePluralFormFunction => {
+	const pluralFormRegex = /^(\s*nplurals\s*=\s*[0-9]+\s*;\s*plural\s*=\s*(?:\s|[-?|&=!<>+*/%:;a-zA-Z0-9_()])+)$/m;
+
+	if (!pluralFormRegex.test(form)) throw new Error(`Plural-Forms is invalid: ${form}`);
+
+	if (!/;\s*$/.test(form)) {
+		form += ';';
+	}
+
+	const code = [
+		'var plural;',
+		'var nplurals;',
+		form,
+		'return (plural === true ? 1 : plural ? plural : 0);',
+	].join('\n');
+
+	// eslint-disable-next-line no-new-func -- There's a regex to check the form but it's still slighlty unsafe, eventually we should automatically generate all the functions in advance in build-translations.ts
+	return (new Function('n', code)) as ParsePluralFormFunction;
+};
+
+const getPluralFunction = (lang: string) => {
+	if (!(lang in pluralFunctions_)) {
+		const locale = closestSupportedLocale(lang);
+		const stats = localeStats()[locale];
+
+		if (!stats.pluralForms) {
+			pluralFunctions_[lang] = null;
+		} else {
+			pluralFunctions_[lang] = parsePluralForm(stats.pluralForms);
+		}
+	}
+
+	return pluralFunctions_[lang];
+};
+
 function defaultLocale() {
 	return defaultLocale_;
 }
@@ -589,18 +629,45 @@ function _(s: string, ...args: any[]): string {
 }

 function _n(singular: string, plural: string, n: number, ...args: any[]) {
-	if (n > 1) return _(plural, ...args);
-	return _(singular, ...args);
+	if (['en_GB', 'en_US'].includes(currentLocale_)) {
+		if (n > 1) return _(plural, ...args);
+		return _(singular, ...args);
+	} else {
+		const pluralFn = getPluralFunction(currentLocale_);
+		const stringIndex = pluralFn ? pluralFn(n) : 0;
+		const strings = localeStrings(currentLocale_);
+		const result = strings[singular];
+
+		let translatedString = '';
+		if (result === undefined || !result.join('')) {
+			translatedString = singular;
+		} else {
+			translatedString = stringIndex < result.length ? result[stringIndex] : result[0];
+		}
+
+		try {
+			return sprintf(translatedString, ...args);
+		} catch (error) {
+			return `${translatedString} ${args.join(', ')} (Translation error: ${error.message})`;
+		}
+	}
 }

 const stringByLocale = (locale: string, s: string, ...args: any[]): string => {
 	const strings = localeStrings(locale);
-	let result = strings[s];
-	if (result === '' || result === undefined) result = s;
+	const result = strings[s];
+	let translatedString = '';
+
+	if (result === undefined || !result.join('')) {
+		translatedString = s;
+	} else {
+		translatedString = result[0];
+	}
+
 	try {
-		return sprintf(result, ...args);
+		return sprintf(translatedString, ...args);
 	} catch (error) {
-		return `${result} ${args.join(', ')} (Translation error: ${error.message})`;
+		return `${translatedString} ${args.join(', ')} (Translation error: ${error.message})`;
 	}
 };

--- a/packages/tools/build-translation.ts
+++ b/packages/tools/build-translation.ts
@@ -1,5 +1,3 @@
-'use strict';
-
 // Dependencies:
 //
 // sudo apt install gettext sudo apt install translate-toolkit
@@ -7,34 +5,36 @@
 // gettext v21+ is required as versions before that have bugs when parsing
 // JavaScript template strings which means we would lose translations.

-const rootDir = `${__dirname}/../..`;
+import markdownUtils from '@joplin/lib/markdownUtils';
+import { translationExecutablePath, removePoHeaderDate, mergePotToPo, parsePoFile, parseTranslations, TranslationStatus } from './utils/translation';
+import { execCommand, isMac, insertContentIntoFile, filename, dirname, fileExtension } from './tool-utils.js';
+import { countryDisplayName, countryCodeOnly } from '@joplin/lib/locale';
+import { readdirSync, writeFileSync } from 'fs';
+import { readFile } from 'fs/promises';
+import { copy, mkdirpSync, remove } from 'fs-extra';
+import { GettextExtractor, JsExtractors } from 'gettext-extractor';

-const markdownUtils = require('@joplin/lib/markdownUtils').default;
-const fs = require('fs-extra');
-const { translationExecutablePath, removePoHeaderDate, mergePotToPo, parsePoFile, parseTranslations } = require('./utils/translation');
+const rootDir = `${__dirname}/../..`;
 const localesDir = `${__dirname}/locales`;
 const libDir = `${rootDir}/packages/lib`;
-const { execCommand, isMac, insertContentIntoFile, filename, dirname, fileExtension } = require('./tool-utils.js');
-const { countryDisplayName, countryCodeOnly } = require('@joplin/lib/locale');

-const { GettextExtractor, JsExtractors } = require('gettext-extractor');
-
-function serializeTranslation(translation) {
+function serializeTranslation(translation: string) {
 	const output = parseTranslations(translation);
-	return JSON.stringify(output, Object.keys(output).sort((a, b) => a.toLowerCase() < b.toLowerCase() ? -1 : +1), ' ');
+	return JSON.stringify(output, Object.keys(output).sort((a, b) => a.toLowerCase() < b.toLowerCase() ? -1 : +1), '\t');
 }

-function saveToFile(filePath, data) {
-	fs.writeFileSync(filePath, data);
+function saveToFile(filePath: string, data: string) {
+	writeFileSync(filePath, data);
 }

-async function buildLocale(inputFile, outputFile) {
+async function buildLocale(inputFile: string, outputFile: string) {
 	const r = await parsePoFile(inputFile);
 	const translation = serializeTranslation(r);
 	saveToFile(outputFile, translation);
+	return { headers: r.headers };
 }

-async function createPotFile(potFilePath) {
+async function createPotFile(potFilePath: string) {
 	const excludedDirs = [
 		'./.git/*',
 		'./.github/*',
@@ -82,7 +82,7 @@ async function createPotFile(potFilePath) {
 	// basename, such as "exmaple.js", and "example.ts", we only keep the file
 	// with ".ts" extension (since the .js should be the compiled file).

-	const toProcess = {};
+	const toProcess: Record<string, string> = {};

 	for (const file of files) {
 		if (!file) continue;
@@ -172,7 +172,7 @@ async function createPotFile(potFilePath) {
 	await removePoHeaderDate(potFilePath);
 }

-function buildIndex(locales, stats) {
+function buildIndex(locales: string[], stats: TranslationStatus[]) {
 	const output = [];
 	output.push('var locales = {};');
 	output.push('var stats = {};');
@@ -196,10 +196,10 @@ function buildIndex(locales, stats) {
 	return output.join('\n');
 }

-function availableLocales(defaultLocale) {
+function availableLocales(defaultLocale: string) {
 	const output = [defaultLocale];
 	// eslint-disable-next-line github/array-foreach -- Old code before rule was applied
-	fs.readdirSync(localesDir).forEach((path) => {
+	readdirSync(localesDir).forEach((path) => {
 		if (fileExtension(path) !== 'po') return;
 		const locale = filename(path);
 		if (locale === defaultLocale) return;
@@ -208,7 +208,7 @@ function availableLocales(defaultLocale) {
 	return output;
 }

-function extractTranslator(regex, poContent) {
+function extractTranslator(regex: RegExp, poContent: string) {
 	const translatorMatch = poContent.match(regex);
 	let translatorName = '';

@@ -225,13 +225,13 @@ function extractTranslator(regex, poContent) {
 	return translatorName;
 }

-function translatorNameToMarkdown(translatorName) {
+function translatorNameToMarkdown(translatorName: string) {
 	const matches = translatorName.match(/^(.*?)\s*\((.*)\)$/);
 	if (!matches) return translatorName;
 	return `[${markdownUtils.escapeTitleText(matches[1])}](mailto:${markdownUtils.escapeLinkUrl(matches[2])})`;
 }

-async function translationStatus(isDefault, poFile) {
+async function translationStatus(isDefault: boolean, poFile: string): Promise<TranslationStatus> {
 	// "apt install translate-toolkit" to have pocount
 	let pocountPath = 'pocount';
 	if (isMac()) pocountPath = translationExecutablePath('pocount');
@@ -248,7 +248,7 @@ async function translationStatus(isDefault, poFile) {
 	const untranslatedCount = Number(untranslatedMatches[1]);

 	let translatorName = '';
-	const content = await fs.readFile(poFile, 'utf-8');
+	const content = await readFile(poFile, 'utf-8');

 	translatorName = extractTranslator(/Last-Translator:\s*?(.*)/, content);
 	if (!translatorName) {
@@ -276,7 +276,7 @@ async function translationStatus(isDefault, poFile) {
 	};
 }

-function flagImageUrl(locale) {
+function flagImageUrl(locale: string) {
 	const baseUrl = 'https://joplinapp.org/images/flags';
 	if (locale === 'ar') return `${baseUrl}/country-4x3/arableague.png`;
 	if (locale === 'eu') return `${baseUrl}/es/basque_country.png`;
@@ -292,11 +292,11 @@ function flagImageUrl(locale) {
 	return `${baseUrl}/country-4x3/${countryCodeOnly(locale).toLowerCase()}.png`;
 }

-function poFileUrl(locale) {
+function poFileUrl(locale: string) {
 	return `https://github.com/laurent22/joplin/blob/dev/packages/tools/locales/${locale}.po`;
 }

-function translationStatusToMdTable(status) {
+function translationStatusToMdTable(status: TranslationStatus[]) {
 	const output = [];
 	output.push(['&nbsp;', 'Language', 'Po File', 'Last translator', 'Percent done'].join('  |  '));
 	output.push(['---', '---', '---', '---', '---'].join('|'));
@@ -308,7 +308,7 @@ function translationStatusToMdTable(status) {
 	return output.join('\n');
 }

-async function updateReadmeWithStats(stats) {
+async function updateReadmeWithStats(stats: TranslationStatus[]) {
 	await insertContentIntoFile(
 		`${rootDir}/README.md`,
 		'<!-- LOCALE-TABLE-AUTO-GENERATED -->\n',
@@ -317,12 +317,12 @@ async function updateReadmeWithStats(stats) {
 	);
 }

-async function translationStrings(poFilePath) {
+async function translationStrings(poFilePath: string) {
 	const r = await parsePoFile(poFilePath);
 	return Object.keys(r.translations['']);
 }

-function deletedStrings(oldStrings, newStrings) {
+function deletedStrings(oldStrings: string[], newStrings: string[]) {
 	const output = [];
 	for (const s1 of oldStrings) {
 		if (newStrings.includes(s1)) continue;
@@ -342,7 +342,7 @@ async function main() {

 	if (missingStringsCheckOnly) {
 		tempPotFilePath = `${localesDir}/joplin-temp-${Math.floor(Math.random() * 10000000)}.pot`;
-		await fs.copy(potFilePath, tempPotFilePath);
+		await copy(potFilePath, tempPotFilePath);
 		potFilePath = tempPotFilePath;
 	}

@@ -359,7 +359,7 @@ async function main() {

 	console.info(`Updated pot file. Total strings: ${oldPotStatus.untranslatedCount} => ${newPotStatus.untranslatedCount}`);

-	if (tempPotFilePath) await fs.remove(tempPotFilePath);
+	if (tempPotFilePath) await remove(tempPotFilePath);

 	const deletedCount = oldPotStatus.untranslatedCount - newPotStatus.untranslatedCount;
 	if (deletedCount >= 5) {
@@ -379,7 +379,7 @@ async function main() {

 	await execCommand(`cp "${potFilePath}" ` + `"${localesDir}/${defaultLocale}.po"`);

-	fs.mkdirpSync(jsonLocalesDir, 0o755);
+	mkdirpSync(jsonLocalesDir, 0o755);

 	const stats = [];

@@ -392,9 +392,10 @@ async function main() {
 		const poFilePäth = `${localesDir}/${locale}.po`;
 		const jsonFilePath = `${jsonLocalesDir}/${locale}.json`;
 		if (locale !== defaultLocale) await mergePotToPo(potFilePath, poFilePäth);
-		await buildLocale(poFilePäth, jsonFilePath);
+		const { headers } = await buildLocale(poFilePäth, jsonFilePath);

 		const stat = await translationStatus(defaultLocale === locale, poFilePäth);
+		stat.pluralForms = headers['Plural-Forms'];
 		stat.locale = locale;
 		stat.languageName = countryDisplayName(locale);
 		stats.push(stat);
--- a/packages/tools/utils/translation.ts
+++ b/packages/tools/utils/translation.ts
@@ -2,7 +2,16 @@ import { execCommand, isMac } from '../tool-utils';
 import { existsSync, readFile } from 'fs-extra';
 const gettextParser = require('gettext-parser');

-export type Translations = Record<string, string>;
+export interface TranslationStatus {
+	locale?: string;
+	languageName?: string;
+	translatorName: string;
+	percentDone: number;
+	untranslatedCount: number;
+	pluralForms?: string;
+}
+
+export type Translations = Record<string, string[]>;

 export const removePoHeaderDate = async (filePath: string) => {
 	let sedPrefix = 'sed -i';
@@ -59,14 +68,14 @@ export const parseTranslations = (gettextTranslations: any) => {
 			if (!translations.hasOwnProperty(n)) continue;
 			if (n === '') continue;
 			const t = translations[n];
-			let translated = '';
+			let translated: string[] = [];
 			if (t.comments && t.comments.flag && t.comments.flag.indexOf('fuzzy') >= 0) {
 				// Don't include fuzzy translations
 			} else {
-				translated = t['msgstr'][0];
+				translated = t['msgstr'];
 			}

-			if (translated) output[n] = translated;
+			if (translated.length) output[n] = translated;
 		}
 	}

--- a/packages/tools/website/utils/applyTranslations.test.ts
+++ b/packages/tools/website/utils/applyTranslations.test.ts
@@ -7,7 +7,7 @@ describe('applyTranslations', () => {
 			{
 				html: '<div><span translate>Translate me</span></div>',
 				translations: {
-					'Translate me': 'Traduis moi',
+					'Translate me': ['Traduis moi'],
 				},
 				htmlTranslated: '<div>\n<span translate>\nTraduis moi\n</span>\n</div>',
 			},
@@ -19,14 +19,14 @@ describe('applyTranslations', () => {
 			{
 				html: '<h1 translate class="text-center">\nFree your <span class="frame-bg frame-bg-blue">notes</span>\n</h1>',
 				translations: {
-					'Free your <span class="frame-bg frame-bg-blue">notes</span>': 'Libérez vos <span class="frame-bg frame-bg-blue">notes</span>',
+					'Free your <span class="frame-bg frame-bg-blue">notes</span>': ['Libérez vos <span class="frame-bg frame-bg-blue">notes</span>'],
 				},
 				htmlTranslated: '<h1 translate class="text-center">\nLibérez vos <span class="frame-bg frame-bg-blue">notes</span>\n</h1>',
 			},
 			{
 				html: '<div translate>Save <span class="frame-bg frame-bg-blue">web pages</span> <br />as notes</div>',
 				translations: {
-					'Save <span class="frame-bg frame-bg-blue">web pages</span> <br>as notes': 'Sauvegardez vos <span class="frame-bg frame-bg-blue">pages web</span> <br>en notes',
+					'Save <span class="frame-bg frame-bg-blue">web pages</span> <br>as notes': ['Sauvegardez vos <span class="frame-bg frame-bg-blue">pages web</span> <br>en notes'],
 				},
 				htmlTranslated: '<div translate>\nSauvegardez vos <span class="frame-bg frame-bg-blue">pages web</span> <br>en notes\n</div>',
 			},
--- a/packages/tools/website/utils/applyTranslations.ts
+++ b/packages/tools/website/utils/applyTranslations.ts
@@ -1,5 +1,6 @@
 import { unique } from '@joplin/lib/ArrayUtils';
 import { attributesHtml, isSelfClosingTag } from '@joplin/renderer/htmlUtils';
+import { Translations } from '../../utils/translation';
 const Entities = require('html-entities').AllHtmlEntities;
 const htmlentities = new Entities().encode;
 const htmlparser2 = require('@joplin/fork-htmlparser2');
@@ -15,7 +16,7 @@ const trimHtml = (content: string) => {
 		.replace(/\t+$/, '');
 };

-const findTranslation = (englishString: string, translations: Record<string, string>): string => {
+const findTranslation = (englishString: string, translations: Translations): string => {
 	const stringsToTry = unique([
 		englishString,
 		englishString.replace(/<br\/>/gi, '<br>'),
@@ -26,7 +27,8 @@ const findTranslation = (englishString: string, translations: Record<string, str
 	]) as string[];

 	for (const stringToTry of stringsToTry) {
-		if (translations[stringToTry]) return translations[stringToTry];
+		// Note that we don't currently support plural forms for the website
+		if (translations[stringToTry] && translations[stringToTry].length) return translations[stringToTry][0];
 	}

 	return englishString;
@@ -38,7 +40,7 @@ const encodeHtml = (decodedText: string): string => {
 		.replace(/{{&gt; /gi, '{{> '); // Don't break Mustache partials
 };

-export default (html: string, _languageCode: string, translations: Record<string, string>) => {
+export default (html: string, _languageCode: string, translations: Translations) => {
 	const output: string[] = [];

 	interface State {
--- a/packages/tools/website/utils/processTranslations.ts
+++ b/packages/tools/website/utils/processTranslations.ts
@@ -1,8 +1,9 @@
 import { mkdirp, readFile, writeFile } from 'fs-extra';
 import { dirname } from 'path';
+import { Translations } from '../../utils/translation';
 import applyTranslations from './applyTranslations';

-export default async (englishFilePath: string, translatedFilePath: string, languageCode: string, translations: Record<string, string>) => {
+export default async (englishFilePath: string, translatedFilePath: string, languageCode: string, translations: Translations) => {
 	let content = await readFile(englishFilePath, 'utf8');
 	content = content.replace('<html lang="en-gb">', `<html lang="${languageCode}">`);
 	const translatedContent = await applyTranslations(content, languageCode, translations);
--- a/packages/tools/website/utils/types.ts
+++ b/packages/tools/website/utils/types.ts
@@ -1,5 +1,6 @@
 import { Plan, StripePublicConfig } from '@joplin/lib/utils/joplinCloud';
 import { Sponsors } from '../../utils/loadSponsors';
+import { Translations } from '../../utils/translation';
 import { OpenGraphTags } from './openGraph';

 export enum Env {
@@ -8,7 +9,7 @@ export enum Env {
 }

 export interface Locale {
-	htmlTranslations: Record<string, string>;
+	htmlTranslations: Translations;
 	lang: string;
 	pathPrefix: string;
 }