ExtremeStudio is a PAWN editor and is designed to be used in SA-MP development.
You can download the app along with auto-updater from here: https://rebrand.ly/ExtremeStudio
All localization is done on Crowdin, Kindly register through this link: https://crowdin.com/project/extremestudio/invite
If there is a missing language, Please create an issue asking for it.