TH18 custom.exe: Translations not supported

[ProjectTojiko]

Probably that's because th18's custom.exe already supports English (for non-Japanese locale)?
But we need support for non-English-speaking users too, just like the older games.

[brliron]

custom.exe had an English version since th14 (I think ZUN introduced that in the Playism version), and we do suppose them, th18 is the only one we don't support.

I think we just forgot to work on custom.exe when we worked on th18. If you look in base_tsa (https://github.com/thpatch/thcrap-tsa/tree/master/base_tsa), you can see a _custom folder for every Touhou game but Touhou 18.