closes #2593

public/src/utils.js

@@ -365,6 +365,18 @@
 			}
 			return i < 0;
 		};
+
+		String.prototype.endsWith = function(suffix) {
+			if (this.length < suffix.length) {
+				return false;
+			}
+			var len = this.length;
+			var suffixLen = suffix.length;
+			for (var i=1; (i <= suffixLen && this[len - i] === suffix[suffixLen - i]); ++i) {
+				continue;
+			}
+			return i > suffixLen;
+		};
 	}
 
 	if ('undefined' !== typeof window) {