Force no locale (for now) when forcing event locale

There's no concept of an event locale yet

indico/modules/events/models/events.py

@@ -45,7 +45,7 @@
 from indico.util.date_time import get_display_tz, now_utc, overlaps
 from indico.util.decorators import strict_classproperty
 from indico.util.enum import RichIntEnum
-from indico.util.i18n import _
+from indico.util.i18n import _, force_locale
 from indico.util.string import format_repr, text_to_repr
 from indico.web.flask.util import url_for
 
@@ -1071,8 +1071,9 @@ def is_user_speaker(self, user):
 
     @contextmanager
     def force_event_locale(self):
-        # TODO: Implement force event locale
-        yield None
+        # TODO: once we have an event locale, force that one
+        with force_locale(None):
+            yield
 
 
 Event.register_location_events()