fix: Localize reactions

In notifications in FluffyChat we
have "Unknown event m.reaction"
for reactions. But it should just be
enough to display the body so it
should look like:
"username: :thumbs_up_emoji:"

lib/src/utils/event_localizations.dart

@@ -216,6 +216,7 @@ abstract class EventLocalizations {
         _localizedBodyNormalMessage(event, i18n, body),
     EventTypes.Message: (event, i18n, body) =>
         _localizedBodyNormalMessage(event, i18n, body),
-    EventTypes.Reaction: null,
+    EventTypes.Reaction: (event, i18n, body) =>
+        _localizedBodyNormalMessage(event, i18n, body),
   };
 }