General Configuration Window, US English: (default)
General Configuration Window, British English:
General Configuration Window, Japanese:
Special thanks to Overlord for providing the British English translation and Scarred Sun for providing the Japanese translation.
Note that the translations aren't complete yet. This is an ongoing side project that will be done in parallel with the regular Gens/GS coding. (Translation files are separate from the code, so translators can work on them independently.)
Also, there's no UI for selecting a language yet, so it defaults to the system language. On Linux, this can be overridden by setting the LANG and LC_ALL variables. I'm not sure about other platforms.