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/cache/driver/Memcache.php

@@ -35,7 +35,7 @@ class Memcache
     public function __construct($options = [])
     {
         if (!extension_loaded('memcache')) {
-            throw new \BadFunctionCallException('not support memcache');
+            throw new \BadFunctionCallException('not support: memcache');
         }
         if (!empty($options)) {
             $this->options = array_merge($this->options, $options);