GitLab

1. HashMap non-thread-safe issus
2. Fix the same problem in pr621, but use a better implementation

Add the following functions:
1. There is now a language cache inside getLanguage to prepare for different languages corresponding to different time zones where the accounts in the server are located

* 修复一个Gson发序列化json文件的空值问题

* Improved fault tolerance for json file deserialization

(without luas)

(without luas)