chore: add remaining translations

Signed-off-by: xsahil03x <[email protected]>

packages/stream_chat_flutter/lib/src/gallery_header.dart

@@ -67,7 +67,7 @@ class GalleryHeader extends StatelessWidget implements PreferredSizeWidget {
           : const SizedBox(),
       backgroundColor: galleryHeaderThemeData.backgroundColor,
       actions: <Widget>[
-        if (message.type != 'ephemeral')
+        if (!message.isEphemeral)
           IconButton(
             icon: StreamSvgIcon.iconMenuPoint(
               color: galleryHeaderThemeData.iconMenuPointColor,
@@ -78,7 +78,7 @@ class GalleryHeader extends StatelessWidget implements PreferredSizeWidget {
           ),
       ],
       centerTitle: true,
-      title: message.type != 'ephemeral'
+      title: !message.isEphemeral
           ? InkWell(
               onTap: onTitleTap,
               child: SizedBox(