Prevent date overflow on issue page on mobile devices

app/assets/stylesheets/generic/mobile.scss

@@ -43,9 +43,11 @@
     }
   }
 
-  .page-title .new-issue-link {
+  .page-title {
+    .note_created_ago, .new-issue-link {
       display: none;
     }
+  }
 
   .issue_edited_ago, .note_edited_ago {
     display: none;