SA Mod Manager does support multi languages for most of its UI, this means it can be translated into another language. If you want to contribute and add a new language, please follow the tutorial here ...

Tutorial: Put XInput9_1_0.dll in your geometry dash folder. Rename the version you want to rainsystem, example: 1.0.dll -> rainsystem.dll then, put dll in your gd folder. Android Tutorial: Open ...