webui: quote strings with slashes in dashboards index view

Strings coming from "translate" function can contain apostrophes
that need to be escaped.

(cherry picked from commit 3c3e227)

Fixes #1235: Special characters not escaped in translations

webui/module/Dashboard/view/dashboard/dashboard/index.phtml

@@ -261,7 +261,7 @@ $this->headTitle($title);
             }
             else {
                $('.running-jobs-container').empty();
-               $('.running-jobs-container').append('<?php echo $this->translate('There are no jobs running.'); ?>');
+               $('.running-jobs-container').append('<?php echo addslashes($this->translate('There are no jobs running.')); ?>');
             }
          },
          error: function() {