fixed non existing translation bug. removed legacy code.

lib/dialect.js

@@ -121,10 +121,14 @@ module.exports = function (options) {
       throw Error("Original string and target locale are mandatory");
     }
 
-    if (!translation || typeof translation !== 'string') {
+    if (typeof translation !== 'string') {
       throw Error("Translation is mandatory");
     }
 
+    if (translation.length === 0) {
+      translation = null;
+    }
+
     // Database
     DIALECT.store.set(query, {translation: translation}, cb);
 
@@ -195,10 +199,5 @@ module.exports = function (options) {
   _options.current_locale = _options.current_locale || 'en';
   _options.locales = _options.locales || ['en'];
 
-  ['current_locale', 'base_locale'].forEach(function (conf) {
-    DIALECT.config(conf, _options[conf]);
-  });
-
-
   return DIALECT;
 };