[Gallery] Bring in Fortnightly banner (#317)

gallery/lib/l10n/gallery_localizations.dart

@@ -3475,7 +3475,7 @@ class GalleryLocalizations {
   }
 
   String get fortnightlyDescription {
-    return Intl.message('A news app',
+    return Intl.message('A content-focused news app',
         locale: _localeName,
         name: 'fortnightlyDescription',
         desc: r'Study description for Fortnightly.');

gallery/lib/l10n/intl_en_US.arb

@@ -123,7 +123,7 @@
   "@shrineDescription": {
     "description": "Study description for Shrine."
   },
-  "fortnightlyDescription": "A news app",
+  "fortnightlyDescription": "A content-focused news app",
   "@fortnightlyDescription": {
     "description": "Study description for Fortnightly."
   },

gallery/lib/l10n/intl_en_US.xml

@@ -116,7 +116,7 @@
   <string
     name="fortnightlyDescription"
     description="Study description for Fortnightly."
-    >A news app</string>
+    >A content-focused news app</string>
   <string
     name="rallyDescription"
     description="Study description for Rally."

gallery/lib/l10n/messages_en_US.dart

@@ -899,7 +899,7 @@ class MessageLookup extends MessageLookupByLibrary {
         "dialogShow": MessageLookupByLibrary.simpleMessage("SHOW DIALOG"),
         "dismiss": MessageLookupByLibrary.simpleMessage("DISMISS"),
         "fortnightlyDescription":
-            MessageLookupByLibrary.simpleMessage("A news app"),
+            MessageLookupByLibrary.simpleMessage("A content-focused news app"),
         "fortnightlyHeadlineArmy": MessageLookupByLibrary.simpleMessage(
             "Reforming The Green Army From Within"),
         "fortnightlyHeadlineBees": MessageLookupByLibrary.simpleMessage(

gallery/lib/pages/home.dart

@@ -84,7 +84,8 @@ class HomePage extends StatelessWidget {
       _CarouselCard(
         title: fortnightlyTitle,
         subtitle: GalleryLocalizations.of(context).fortnightlyDescription,
-        // TODO: Provide asset for study banner.
+        asset: 'assets/studies/fortnightly_card.png',
+        assetDark: 'assets/studies/fortnightly_card_dark.png',
         study: FortnightlyApp(navigatorKey: NavigatorKeys.fortnightly),
         navigatorKey: NavigatorKeys.fortnightly,
       ),
@@ -914,6 +915,7 @@ class _DesktopPageButton extends StatelessWidget {
               onTap: onTap,
               child: Icon(
                 isEnd ? Icons.arrow_forward_ios : Icons.arrow_back_ios,
+                color: Colors.white,
               ),
             ),
           ),