Fix locale

locales/en.json

       "noGroupSelected": "No group selected. Please select your group using the big beautiful red button bellow.",
       "favorites": "Favorites",
       "mascotDialog": {
-        "title": "Skipping classes is bad",
+        "title": "Don't skip class",
         "message": "Here is Planex! You can set your class and your crush's to favorites in order to find them back easily!\n\nIf you mainly use Campus for Planex, go to the settings to make the app directly start on it!",
         "ok": "Settings",
         "cancel": "Later"