Currently, only the Android port of EasyRPG Player has proper translation support.
You can translate the strings to your native language online or download them for offline translation over at Transifex, then submit it to us.
You can do so through Transifex (preferred) or create a pull request for the raw 'strings.xml' file over at GitHub.
There are no additional texts ready and pending to be translated currently, but there will be later, for example for this information website or for EasyRPG Editor. Please come back later.