改进Handle类支持异常的多语言 Lang类增加has方法 增加核心中文语言包

library/think/session/driver/Redis.php

@@ -42,7 +42,7 @@ class Redis extends SessionHandler
     {
         // 检测php环境
         if (!extension_loaded('redis')) {
-            throw new Exception('_NOT_SUPPERT_:redis');
+            throw new Exception('not support:redis');
         }
         $this->handler = new \Redis;