Initialise Babel on application startup

app/__init__.py

@@ -17,6 +17,7 @@
 import os
 
 from flask import Flask, render_template
+from flask_babel import Babel
 
 
 class CalendarSocialApp(Flask):
@@ -28,6 +29,7 @@ class CalendarSocialApp(Flask):
         config_name = os.environ.get('ENV', config or 'dev')
         self.config.from_pyfile(f'config_{config_name}.py', True)
         db.init_app(self)
+        babel = Babel(app=self)
 
 
 app = CalendarSocialApp(__name__)