Fix: isEmpty() return true if it's empty

src/Model/Translatable/TranslationMethods.php

@@ -93,6 +93,13 @@ public function getLocale()
      */
     public function isEmpty()
     {
-        return false;
+        foreach (get_object_vars($this) as $var => $value) {
+            if (in_array($var, array('id', 'translatable', 'locale')))
+                continue;
+
+            if (!empty($value))
+                return false;
+        }
+        return true;
     }
 }