GitLab

* feat:new command "join" and "remove" to force join or remove avatar in your current team

* fix:change MaxAvatarsInTeam from 9 to 4

* feat:update & merge branch.Translate fix

Removed invalid code in getLanguageFileDescription,When the language is not discovered, it will use the built-in language fallback mechanism to fall back,At the same time, we also fix the issue that using language in the server does not save the settings of the server side locale

* Fix the following issues:
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

* add /language command,each account has their own Locate

fix issue 648 677