compose: Avoid translating Zulip message destinations

The '#channel > topic' style strings are not supposed to be translated
into different languages as they are Zulip's language of expressing the
desintation, not something bound to the English language.

See also:
  zulip#1148 (comment)

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

Author: PIG208

Diff for: assets/l10n/app_en.arb

@@ -355,12 +355,11 @@
       "channel": {"type": "String", "example": "channel name"}
     }
   },
-  "composeBoxChannelTopicContentHint": "Message #{channel} > {topic}",
+  "composeBoxChannelTopicContentHint": "Message {destination}",
   "@composeBoxChannelTopicContentHint": {
     "description": "Hint text for content input when sending a message to a topic in a channel",
     "placeholders": {
-      "channel": {"type": "String", "example": "channel name"},
-      "topic": {"type": "String", "example": "topic name"}
+      "destination": {"type": "String", "example": "#channel name > topic name"}
     }
   },
   "composeBoxSendTooltip": "Send",

Diff for: lib/generated/l10n/zulip_localizations.dart

@@ -576,8 +576,8 @@ abstract class ZulipLocalizations {
   /// Hint text for content input when sending a message to a topic in a channel
   ///
   /// In en, this message translates to:
-  /// **'Message #{channel} > {topic}'**
-  String composeBoxChannelTopicContentHint(String channel, String topic);
+  /// **'Message {destination}'**
+  String composeBoxChannelTopicContentHint(String destination);
 
   /// Tooltip for send button in compose box.
   ///

Diff for: lib/generated/l10n/zulip_localizations_ar.dart

@@ -281,8 +281,8 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   }
 
   @override
-  String composeBoxChannelTopicContentHint(String channel, String topic) {
-    return 'Message #$channel > $topic';
+  String composeBoxChannelTopicContentHint(String destination) {
+    return 'Message $destination';
   }
 
   @override

Diff for: lib/generated/l10n/zulip_localizations_en.dart

@@ -281,8 +281,8 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   }
 
   @override
-  String composeBoxChannelTopicContentHint(String channel, String topic) {
-    return 'Message #$channel > $topic';
+  String composeBoxChannelTopicContentHint(String destination) {
+    return 'Message $destination';
   }
 
   @override

Diff for: lib/generated/l10n/zulip_localizations_ja.dart

@@ -281,8 +281,8 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   }
 
   @override
-  String composeBoxChannelTopicContentHint(String channel, String topic) {
-    return 'Message #$channel > $topic';
+  String composeBoxChannelTopicContentHint(String destination) {
+    return 'Message $destination';
   }
 
   @override

Diff for: lib/generated/l10n/zulip_localizations_nb.dart

@@ -281,8 +281,8 @@ class ZulipLocalizationsNb extends ZulipLocalizations {
   }
 
   @override
-  String composeBoxChannelTopicContentHint(String channel, String topic) {
-    return 'Message #$channel > $topic';
+  String composeBoxChannelTopicContentHint(String destination) {
+    return 'Message $destination';
   }
 
   @override

Diff for: lib/generated/l10n/zulip_localizations_pl.dart

@@ -281,8 +281,8 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
   }
 
   @override
-  String composeBoxChannelTopicContentHint(String channel, String topic) {
-    return 'Message #$channel > $topic';
+  String composeBoxChannelTopicContentHint(String destination) {
+    return 'Message $destination';
   }
 
   @override

Diff for: lib/generated/l10n/zulip_localizations_ru.dart

@@ -281,8 +281,8 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
   }
 
   @override
-  String composeBoxChannelTopicContentHint(String channel, String topic) {
-    return 'Message #$channel > $topic';
+  String composeBoxChannelTopicContentHint(String destination) {
+    return 'Message $destination';
   }
 
   @override

Diff for: lib/generated/l10n/zulip_localizations_sk.dart

@@ -281,8 +281,8 @@ class ZulipLocalizationsSk extends ZulipLocalizations {
   }
 
   @override
-  String composeBoxChannelTopicContentHint(String channel, String topic) {
-    return 'Message #$channel > $topic';
+  String composeBoxChannelTopicContentHint(String destination) {
+    return 'Message $destination';
   }
 
   @override

Diff for: lib/widgets/compose_box.dart

@@ -591,7 +591,7 @@ class _StreamContentInputState extends State<_StreamContentInput> {
         && widget.controller.topic.isTopicEmpty
           ? zulipLocalizations.composeBoxChannelContentHint(streamName)
           : zulipLocalizations.composeBoxChannelTopicContentHint(
-              streamName, topic.displayName));
+              '#$streamName > ${topic.displayName}'));
   }
 }
 
@@ -650,7 +650,7 @@ class _FixedDestinationContentInput extends StatelessWidget {
         final streamName = store.streams[streamId]?.name
           ?? zulipLocalizations.unknownChannelName;
         return zulipLocalizations.composeBoxChannelTopicContentHint(
-          streamName, topic.displayName);
+          '#$streamName > ${topic.displayName}');
 
       case DmNarrow(otherRecipientIds: []): // The self-1:1 thread.
         return zulipLocalizations.composeBoxSelfDmContentHint;