feat!: Use new localisation setup from flutter 1.22

BREAKING CHANGE: This introduces that it might require up to 2 compiles for locals to work.
Also only arb files shall be checked into git.

Took 19 minutes

lib/components/reply_content.dart

@@ -1,6 +1,7 @@
 import 'package:famedlysdk/famedlysdk.dart';
-import 'package:fluffychat/l10n/l10n.dart';
+import 'package:fluffychat/utils/matrix_locals.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/l10n.dart';
 
 import 'html_message.dart';
 import 'matrix.dart';
@@ -47,7 +48,7 @@ class ReplyContent extends StatelessWidget {
     } else {
       replyBody = Text(
         displayEvent?.getLocalizedBody(
-              L10n.of(context),
+              MatrixLocals(L10n.of(context)),
               withSenderNamePrefix: false,
               hideReply: true,
             ) ??