Make it possible to exclude Console.js and Lang/en.js for really small builds. r=bartvde (closes #2882)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10967 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Lang.js

@@ -101,7 +101,7 @@ OpenLayers.Lang = {
      */
     translate: function(key, context) {
         var dictionary = OpenLayers.Lang[OpenLayers.Lang.getCode()];
-        var message = dictionary[key];
+        var message = dictionary && dictionary[key];
         if(!message) {
             // Message not found, fall back to message key
             message = key;