Desktop: Fix errors found by automated accessibility testing (#11246)

Co-authored-by: Laurent Cozic <laurent22@users.noreply.github.com>

packages/app-mobile/components/NoteEditor/NoteEditor.tsx

@@ -348,6 +348,8 @@ function NoteEditor(props: Props, ref: any) {
 		autocompleteMarkup: Setting.value('editor.autocompleteMarkup'),
 
 		indentWithTabs: true,
+
+		editorLabel: _('Markdown editor'),
 	}), [props.themeId, props.readOnly]);
 
 	const injectedJavaScript = `