add translate test (test if it work & models are downloaded)

tests/test_api/test_api_translate.py

@@ -0,0 +1,16 @@
+import json
+
+
+def test_api_detect_language(client):
+    response = client.post("/translate", data={
+        "q": "Hello",
+        "source": "en",
+        "target": "es",
+        "format": "text"
+    })
+
+    response_json = json.loads(response.data)
+
+    assert "translatedText" in response_json
+    assert response.status_code == 200
+