Fix up locale-patch

// FREEBIE

Gruntfile.js

@@ -218,10 +218,12 @@ module.exports = function(grunt) {
       var messages = grunt.file.readJSON(abspath);
 
       for (var key in messages){
+        if (en[key] !== undefined && messages[key] !== undefined){
           if (en[key].placeholders !== undefined && messages[key].placeholders === undefined){
             messages[key].placeholders = en[key].placeholders;
           }
         }
+      }
 
       grunt.file.write(abspath, JSON.stringify(messages, null, 4) + '\n');
     });