FIX: staff message color was wrong on mobile

app/assets/stylesheets/mobile/topic-post.scss

@@ -338,7 +338,7 @@ span.post-count {
 
 .topic-post {
   &.moderator {
-    background-color: scale-color($highlight, $lightness: 75%);
+    background-color: dark-light-diff($highlight, $secondary, 70%, -80%);
   }
 }
 

config/locales/server.en.yml

@@ -1824,6 +1824,7 @@ en:
 
     digest:
       why: "A brief summary of %{site_link} since your last visit on %{last_seen_at}"
+      subject_template: "[%{site_name}] Digest"
       new_activity: "New activity on your topics and posts:"
       top_topics: "Popular posts"
       other_new_topics: "Popular topics"