home: Add placeholder text for empty Inbox, Channels, and Direct messages

The Figma has some graphics on all of these, but we'll leave that
for later: see issue #1551.

Fixes: #385
Fixes: #386

Author: chrisbobbe

assets/l10n/app_en.arb

@@ -781,6 +781,10 @@
   "@inboxPageTitle": {
     "description": "Title for the page with unreads."
   },
+  "inboxEmptyPlaceholder": "There are no unread messages in your inbox.",
+  "@inboxEmptyPlaceholder": {
+    "description": "Centered text on the 'Inbox' page saying that there is no content to show."
+  },
   "recentDmConversationsPageTitle": "Direct messages",
   "@recentDmConversationsPageTitle": {
     "description": "Title for the page with a list of DM conversations."
@@ -789,6 +793,10 @@
   "@recentDmConversationsSectionHeader": {
     "description": "Heading for direct messages section on the 'Inbox' message view."
   },
+  "recentDmConversationsEmptyPlaceholder": "You have no direct messages yet! Why not start the conversation?",
+  "@recentDmConversationsEmptyPlaceholder": {
+    "description": "Centered text on the 'Direct messages' page saying that there is no content to show."
+  },
   "combinedFeedPageTitle": "Combined feed",
   "@combinedFeedPageTitle": {
     "description": "Page title for the 'Combined feed' message view."
@@ -805,6 +813,10 @@
   "@channelsPageTitle": {
     "description": "Title for the page with a list of subscribed channels."
   },
+  "channelsEmptyPlaceholder": "You are not subscribed to any channels yet.",
+  "@channelsEmptyPlaceholder": {
+    "description": "Centered text on the 'Channels' page saying that there is no content to show."
+  },
   "mainMenuMyProfile": "My profile",
   "@mainMenuMyProfile": {
     "description": "Label for main-menu button leading to the user's own profile."
@@ -833,10 +845,6 @@
   "@unpinnedSubscriptionsLabel": {
     "description": "Label for the list of unpinned subscribed channels."
   },
-  "subscriptionListNoChannels": "No channels found",
-  "@subscriptionListNoChannels": {
-    "description": "Text to display on subscribed-channels page when there are no subscribed channels."
-  },
   "notifSelfUser": "You",
   "@notifSelfUser": {
     "description": "Display name for the user themself, to show after replying in an Android notification"

lib/generated/l10n/zulip_localizations.dart

@@ -1181,6 +1181,12 @@ abstract class ZulipLocalizations {
   /// **'Inbox'**
   String get inboxPageTitle;
 
+  /// Centered text on the 'Inbox' page saying that there is no content to show.
+  ///
+  /// In en, this message translates to:
+  /// **'There are no unread messages in your inbox.'**
+  String get inboxEmptyPlaceholder;
+
   /// Title for the page with a list of DM conversations.
   ///
   /// In en, this message translates to:
@@ -1193,6 +1199,12 @@ abstract class ZulipLocalizations {
   /// **'Direct messages'**
   String get recentDmConversationsSectionHeader;
 
+  /// Centered text on the 'Direct messages' page saying that there is no content to show.
+  ///
+  /// In en, this message translates to:
+  /// **'You have no direct messages yet! Why not start the conversation?'**
+  String get recentDmConversationsEmptyPlaceholder;
+
   /// Page title for the 'Combined feed' message view.
   ///
   /// In en, this message translates to:
@@ -1217,6 +1229,12 @@ abstract class ZulipLocalizations {
   /// **'Channels'**
   String get channelsPageTitle;
 
+  /// Centered text on the 'Channels' page saying that there is no content to show.
+  ///
+  /// In en, this message translates to:
+  /// **'You are not subscribed to any channels yet.'**
+  String get channelsEmptyPlaceholder;
+
   /// Label for main-menu button leading to the user's own profile.
   ///
   /// In en, this message translates to:
@@ -1253,12 +1271,6 @@ abstract class ZulipLocalizations {
   /// **'Unpinned'**
   String get unpinnedSubscriptionsLabel;
 
-  /// Text to display on subscribed-channels page when there are no subscribed channels.
-  ///
-  /// In en, this message translates to:
-  /// **'No channels found'**
-  String get subscriptionListNoChannels;
-
   /// Display name for the user themself, to show after replying in an Android notification
   ///
   /// In en, this message translates to:

lib/generated/l10n/zulip_localizations_ar.dart

@@ -639,12 +639,20 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   @override
   String get inboxPageTitle => 'Inbox';
 
+  @override
+  String get inboxEmptyPlaceholder =>
+      'There are no unread messages in your inbox.';
+
   @override
   String get recentDmConversationsPageTitle => 'Direct messages';
 
   @override
   String get recentDmConversationsSectionHeader => 'Direct messages';
 
+  @override
+  String get recentDmConversationsEmptyPlaceholder =>
+      'You have no direct messages yet! Why not start the conversation?';
+
   @override
   String get combinedFeedPageTitle => 'Combined feed';
 
@@ -657,6 +665,10 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   @override
   String get channelsPageTitle => 'Channels';
 
+  @override
+  String get channelsEmptyPlaceholder =>
+      'You are not subscribed to any channels yet.';
+
   @override
   String get mainMenuMyProfile => 'My profile';
 
@@ -683,9 +695,6 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   @override
   String get unpinnedSubscriptionsLabel => 'Unpinned';
 
-  @override
-  String get subscriptionListNoChannels => 'No channels found';
-
   @override
   String get notifSelfUser => 'You';
 

lib/generated/l10n/zulip_localizations_de.dart

@@ -639,12 +639,20 @@ class ZulipLocalizationsDe extends ZulipLocalizations {
   @override
   String get inboxPageTitle => 'Inbox';
 
+  @override
+  String get inboxEmptyPlaceholder =>
+      'There are no unread messages in your inbox.';
+
   @override
   String get recentDmConversationsPageTitle => 'Direct messages';
 
   @override
   String get recentDmConversationsSectionHeader => 'Direct messages';
 
+  @override
+  String get recentDmConversationsEmptyPlaceholder =>
+      'You have no direct messages yet! Why not start the conversation?';
+
   @override
   String get combinedFeedPageTitle => 'Combined feed';
 
@@ -657,6 +665,10 @@ class ZulipLocalizationsDe extends ZulipLocalizations {
   @override
   String get channelsPageTitle => 'Channels';
 
+  @override
+  String get channelsEmptyPlaceholder =>
+      'You are not subscribed to any channels yet.';
+
   @override
   String get mainMenuMyProfile => 'My profile';
 
@@ -683,9 +695,6 @@ class ZulipLocalizationsDe extends ZulipLocalizations {
   @override
   String get unpinnedSubscriptionsLabel => 'Unpinned';
 
-  @override
-  String get subscriptionListNoChannels => 'No channels found';
-
   @override
   String get notifSelfUser => 'You';
 

lib/generated/l10n/zulip_localizations_en.dart

@@ -639,12 +639,20 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   @override
   String get inboxPageTitle => 'Inbox';
 
+  @override
+  String get inboxEmptyPlaceholder =>
+      'There are no unread messages in your inbox.';
+
   @override
   String get recentDmConversationsPageTitle => 'Direct messages';
 
   @override
   String get recentDmConversationsSectionHeader => 'Direct messages';
 
+  @override
+  String get recentDmConversationsEmptyPlaceholder =>
+      'You have no direct messages yet! Why not start the conversation?';
+
   @override
   String get combinedFeedPageTitle => 'Combined feed';
 
@@ -657,6 +665,10 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   @override
   String get channelsPageTitle => 'Channels';
 
+  @override
+  String get channelsEmptyPlaceholder =>
+      'You are not subscribed to any channels yet.';
+
   @override
   String get mainMenuMyProfile => 'My profile';
 
@@ -683,9 +695,6 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   @override
   String get unpinnedSubscriptionsLabel => 'Unpinned';
 
-  @override
-  String get subscriptionListNoChannels => 'No channels found';
-
   @override
   String get notifSelfUser => 'You';
 

lib/generated/l10n/zulip_localizations_ja.dart

@@ -639,12 +639,20 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   @override
   String get inboxPageTitle => 'Inbox';
 
+  @override
+  String get inboxEmptyPlaceholder =>
+      'There are no unread messages in your inbox.';
+
   @override
   String get recentDmConversationsPageTitle => 'Direct messages';
 
   @override
   String get recentDmConversationsSectionHeader => 'Direct messages';
 
+  @override
+  String get recentDmConversationsEmptyPlaceholder =>
+      'You have no direct messages yet! Why not start the conversation?';
+
   @override
   String get combinedFeedPageTitle => 'Combined feed';
 
@@ -657,6 +665,10 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   @override
   String get channelsPageTitle => 'Channels';
 
+  @override
+  String get channelsEmptyPlaceholder =>
+      'You are not subscribed to any channels yet.';
+
   @override
   String get mainMenuMyProfile => 'My profile';
 
@@ -683,9 +695,6 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   @override
   String get unpinnedSubscriptionsLabel => 'Unpinned';
 
-  @override
-  String get subscriptionListNoChannels => 'No channels found';
-
   @override
   String get notifSelfUser => 'You';
 

lib/generated/l10n/zulip_localizations_nb.dart

@@ -639,12 +639,20 @@ class ZulipLocalizationsNb extends ZulipLocalizations {
   @override
   String get inboxPageTitle => 'Inbox';
 
+  @override
+  String get inboxEmptyPlaceholder =>
+      'There are no unread messages in your inbox.';
+
   @override
   String get recentDmConversationsPageTitle => 'Direct messages';
 
   @override
   String get recentDmConversationsSectionHeader => 'Direct messages';
 
+  @override
+  String get recentDmConversationsEmptyPlaceholder =>
+      'You have no direct messages yet! Why not start the conversation?';
+
   @override
   String get combinedFeedPageTitle => 'Combined feed';
 
@@ -657,6 +665,10 @@ class ZulipLocalizationsNb extends ZulipLocalizations {
   @override
   String get channelsPageTitle => 'Channels';
 
+  @override
+  String get channelsEmptyPlaceholder =>
+      'You are not subscribed to any channels yet.';
+
   @override
   String get mainMenuMyProfile => 'My profile';
 
@@ -683,9 +695,6 @@ class ZulipLocalizationsNb extends ZulipLocalizations {
   @override
   String get unpinnedSubscriptionsLabel => 'Unpinned';
 
-  @override
-  String get subscriptionListNoChannels => 'No channels found';
-
   @override
   String get notifSelfUser => 'You';
 

lib/generated/l10n/zulip_localizations_pl.dart

@@ -648,12 +648,20 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
   @override
   String get inboxPageTitle => 'Odebrane';
 
+  @override
+  String get inboxEmptyPlaceholder =>
+      'There are no unread messages in your inbox.';
+
   @override
   String get recentDmConversationsPageTitle => 'Wiadomości bezpośrednie';
 
   @override
   String get recentDmConversationsSectionHeader => 'Wiadomości bezpośrednie';
 
+  @override
+  String get recentDmConversationsEmptyPlaceholder =>
+      'You have no direct messages yet! Why not start the conversation?';
+
   @override
   String get combinedFeedPageTitle => 'Mieszany widok';
 
@@ -666,6 +674,10 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
   @override
   String get channelsPageTitle => 'Kanały';
 
+  @override
+  String get channelsEmptyPlaceholder =>
+      'You are not subscribed to any channels yet.';
+
   @override
   String get mainMenuMyProfile => 'Mój profil';
 
@@ -692,9 +704,6 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
   @override
   String get unpinnedSubscriptionsLabel => 'Odpięte';
 
-  @override
-  String get subscriptionListNoChannels => 'Nie odnaleziono kanałów';
-
   @override
   String get notifSelfUser => 'Ty';
 

lib/generated/l10n/zulip_localizations_ru.dart

@@ -652,12 +652,20 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
   @override
   String get inboxPageTitle => 'Входящие';
 
+  @override
+  String get inboxEmptyPlaceholder =>
+      'There are no unread messages in your inbox.';
+
   @override
   String get recentDmConversationsPageTitle => 'Личные сообщения';
 
   @override
   String get recentDmConversationsSectionHeader => 'Личные сообщения';
 
+  @override
+  String get recentDmConversationsEmptyPlaceholder =>
+      'You have no direct messages yet! Why not start the conversation?';
+
   @override
   String get combinedFeedPageTitle => 'Объединенная лента';
 
@@ -670,6 +678,10 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
   @override
   String get channelsPageTitle => 'Каналы';
 
+  @override
+  String get channelsEmptyPlaceholder =>
+      'You are not subscribed to any channels yet.';
+
   @override
   String get mainMenuMyProfile => 'Мой профиль';
 
@@ -696,9 +708,6 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
   @override
   String get unpinnedSubscriptionsLabel => 'Откреплены';
 
-  @override
-  String get subscriptionListNoChannels => 'Каналы не найдены';
-
   @override
   String get notifSelfUser => 'Вы';