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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

* I forgot to git add...sorry,,this pr is to fix pr780, uploaded LanguageCommand.java

* 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

Format string is `"given_level": "Given %s with level %s %s times to %s"`

fix issues 648 677

Change target perm from target.perm to x.perm.others

fix #635

Co-authored-by: AnimeGitB <AnimeGitB@bigblueball.in>

Optimize multilingualism (using variables)