i18n: Sweep for non-localized '(unknown user)' strings

Signed-off-by: Zixuan James Li <[email protected]>

Author: PIG208

lib/widgets/emoji_reaction.dart

@@ -147,6 +147,7 @@ class ReactionChip extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final store = PerAccountStoreWidget.of(context);
+    final zulipLocalizations = ZulipLocalizations.of(context);
 
     final reactionType = reactionWithVotes.reactionType;
     final emojiCode = reactionWithVotes.emojiCode;
@@ -161,7 +162,7 @@ class ReactionChip extends StatelessWidget {
       ? userIds.map((id) {
           return id == store.selfUserId
             ? 'You'
-            : store.users[id]?.fullName ?? '(unknown user)'; // TODO(i18n)
+            : store.users[id]?.fullName ?? zulipLocalizations.unknownUserName;
         }).join(', ')
       : userIds.length.toString();
 

lib/widgets/inbox.dart

@@ -384,16 +384,20 @@ class _DmItem extends StatelessWidget {
     final store = PerAccountStoreWidget.of(context);
     final selfUser = store.users[store.selfUserId]!;
 
+    final zulipLocalizations = ZulipLocalizations.of(context);
     final designVariables = DesignVariables.of(context);
 
     final title = switch (narrow.otherRecipientIds) { // TODO dedupe with [RecentDmConversationsItem]
       [] => selfUser.fullName,
-      [var otherUserId] => store.users[otherUserId]?.fullName ?? '(unknown user)',
+      [var otherUserId] =>
+        store.users[otherUserId]?.fullName ?? zulipLocalizations.unknownUserName,
 
       // TODO(i18n): List formatting, like you can do in JavaScript:
       //   new Intl.ListFormat('ja').format(['Chris', 'Greg', 'Alya', 'Shu'])
       //   // 'Chris、Greg、Alya、Shu'
-      _ => narrow.otherRecipientIds.map((id) => store.users[id]?.fullName ?? '(unknown user)').join(', '),
+      _ => narrow.otherRecipientIds.map(
+        (id) => store.users[id]?.fullName ?? zulipLocalizations.unknownUserName
+      ).join(', '),
     };
 
     return Material(

lib/widgets/message_list.dart

@@ -415,7 +415,8 @@ class MessageListAppBarTitle extends StatelessWidget {
         if (otherRecipientIds.isEmpty) {
           return Text(zulipLocalizations.dmsWithYourselfPageTitle);
         } else {
-          final names = otherRecipientIds.map((id) => store.users[id]?.fullName ?? '(unknown user)');
+          final names = otherRecipientIds.map(
+            (id) => store.users[id]?.fullName ?? zulipLocalizations.unknownUserName);
           return Text("DMs with ${names.join(", ")}"); // TODO show avatars
         }
     }

lib/widgets/profile.dart

@@ -291,8 +291,9 @@ class _UserWidget extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final store = PerAccountStoreWidget.of(context);
+    final zulipLocalizations = ZulipLocalizations.of(context);
     final user = store.users[userId];
-    final fullName = user?.fullName ?? '(unknown user)';
+    final fullName = user?.fullName ?? zulipLocalizations.unknownUserName;
     return InkWell(
       onTap: () => Navigator.push(context,
         ProfilePage.buildRoute(context: context,

lib/widgets/recent_dm_conversations.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 
+import '../generated/l10n/zulip_localizations.dart';
 import '../model/narrow.dart';
 import '../model/recent_dm_conversations.dart';
 import '../model/unreads.dart';
@@ -81,6 +82,7 @@ class RecentDmConversationsItem extends StatelessWidget {
     final store = PerAccountStoreWidget.of(context);
     final selfUser = store.users[store.selfUserId]!;
 
+    final zulipLocalizations = ZulipLocalizations.of(context);
     final designVariables = DesignVariables.of(context);
 
     final String title;
@@ -94,13 +96,15 @@ class RecentDmConversationsItem extends StatelessWidget {
         //   (should we offer a "spam folder" style summary screen of recent
         //   1:1 DM conversations from muted users?)
         final otherUser = store.users[otherUserId];
-        title = otherUser?.fullName ?? '(unknown user)';
+        title = otherUser?.fullName ?? zulipLocalizations.unknownUserName;
         avatar = AvatarImage(userId: otherUserId, size: _avatarSize);
       default:
         // TODO(i18n): List formatting, like you can do in JavaScript:
         //   new Intl.ListFormat('ja').format(['Chris', 'Greg', 'Alya'])
         //   // 'Chris、Greg、Alya'
-        title = narrow.otherRecipientIds.map((id) => store.users[id]?.fullName ?? '(unknown user)').join(', ');
+        title = narrow.otherRecipientIds.map(
+          (id) => store.users[id]?.fullName ?? zulipLocalizations.unknownUserName
+        ).join(', ');
         avatar = ColoredBox(color: designVariables.groupDmConversationIconBg,
           child: Center(
             child: Icon(color: designVariables.groupDmConversationIcon,