diff --git a/themes/bootstrap3/js/common.js b/themes/bootstrap3/js/common.js
index f2aa4983560b89a0cc2fbeb1dde742dde504ce77..6ec9358ddd7a774a20c125fecd2ebfa93f444107 100644
--- a/themes/bootstrap3/js/common.js
+++ b/themes/bootstrap3/js/common.js
@@ -5,7 +5,7 @@ function VuFindNamespace(p, s) {
   var strings = s;
 
   var getPath = function() { return path; };
-  var translate = function(op) { return strings[op]; };
+  var translate = function(op) { return strings[op] || op; };
 
   return {
     getPath: getPath,