Sorry, that's not possible with the Skirmisher right now. If I'll ever release a new version, I'll try to support different languages, but for this version right now it's just not possible, especially with all the ship and device names.
Basically all I could do is maybe to translate the interface of the Skirmisher, but everything else gets read directly from the selected mod ... so names of shipclasses, devices, etc. will always be in the language the mod authors intended them to be in. Even worse, the Skirmisher uses the internal names of everything and not the "real names" the player usually sees while playing the game. So multi-language support is pretty much non-existant right now.