Fixed showing translations always, regardsless of is ROOT_URL set correctly or not.

Thanks to xet7 !

server/publications/activities.js

@@ -12,10 +12,15 @@ Meteor.publish('activities', (kind, id, limit, showActivities) => {
       return ['board', 'card'].indexOf(x) !== -1;
     }),
   );
-  check(id, String);
+  check(id, Match.Maybe(String));
   check(limit, Number);
   check(showActivities, Boolean);
 
+  // Return empty cursor if id is null or undefined
+  if (!id) {
+    return this.ready();
+  }
+
   // Get linkedBoard
   let linkedElmtId = [id];
   if (kind == 'board') {