Minor text change

Just a minor text change. The user should be adressed by simply using "you". Otherwise a user could think it's an error that just happened randomly so they retry. By addressing them with "you" it can make this message a bit more clear.

app/Http/Controllers/BookmarkController.php

@@ -31,7 +31,7 @@ class BookmarkController extends Controller
             abort_if(
                 $profile->id !== $status->profile_id && !FollowerService::follows($profile->id, $status->profile_id),
                 404,
-                'Error: Cannot bookmark private posts from accounts you do not follow.'
+                'Error: You cannot bookmark private posts from accounts you do not follow.'
             );
         }