modified: .env.example

modified:   Dockerfile
	modified:   app.py
	new file:   locales/de-DE.json
	modified:   templates/login.html
	modified:   templates/playlists.html
	modified:   templates/quiz.html

.env.example

@@ -7,4 +7,6 @@ SPOTIPY_REDIRECT_URI=http://localhost:5000/callback
 SECRET_KEY=dein_geheimer_flask_key
 
 # Flask Umgebung (optional)
-FLASK_ENV=development
+FLASK_ENV=development
+
+LANG=de-DE