Merge branch 'master' into dev
* replaced hard coded chat messages in YABMCommand with localized ones

+ added ChatHelper class
* replaced hard coded chat messages in BackupTickHandler
* minor modifications and optimizations
+ implemented persistent backup functionality

- removed config entry for timestampFormat, is now a fixed value

* refactored startBackup() in BackupTickHandler and moved logic to backup()
* added isFirstBackup() to check if a backup has already been made today
* added localization entries
Merge branch 'dev'
+ added changelog

* bumped version to 0.4.1