魔改json库，最后套一层pcall防止致命错误

LANG/lang_en.lua

@@ -68,6 +68,7 @@ return{
 	registerSuccessed="Registered!",
 	registerFailed="Registration failed",
 	netErrorCode="Network error code",
+	jsonError="Json error",
 	noUsername="Please enter your username",
 	wrongEmail="Wrong email address",
 	noPassword="Please enter your password",

LANG/lang_symbol.lua

@@ -68,6 +68,7 @@ return{
 	registerSuccessed="Register successed!",
 	registerFailed="Register failed",
 	netErrorCode="Network error code",
+	jsonError="Json error",
 	noUsername="Input username",
 	wrongEmail="Wrong email address",
 	noPassword="Input password",

LANG/lang_zh.lua

@@ -68,6 +68,7 @@ return{
 	registerSuccessed="注册成功!",
 	registerFailed="注册失败",
 	netErrorCode="网络错误码",
+	jsonError="json错误",
 	noUsername="请填写用户名",
 	wrongEmail="邮箱格式错误",
 	noPassword="请填写密码",