puts a placeholder description file when all description sources file to find a description (localizable) 3, a=chris

diff --git a/src/library/media_jobs/DescriptionUpdateJob.php b/src/library/media_jobs/DescriptionUpdateJob.php
index 5ca7e8c3c..6fd35faef 100644
--- a/src/library/media_jobs/DescriptionUpdateJob.php
+++ b/src/library/media_jobs/DescriptionUpdateJob.php
@@ -289,7 +289,7 @@ class DescriptionUpdateJob extends MediaJob
             if (!$found_details && !$test_mode) {
                 file_put_contents($thumb_folder_path .
                     "/$resource_detail.txt",
-                        tl('descriptionupdate_no_description_found'));
+                        L\tl('descriptionupdate_no_description_found'));
             }
             $i++;
         }