By the way, @CliveBarker, @AFaustini, @Wattoo, @cyanjiang, there's not a lot that's been changed/added for 6.4 translation-wise, but there's probably a thing or two. I took a quick look and my guess would be that these are the files that changed:
OptionsForm.resx
Strings.resx
MainForm.resx
There could be more but that's all I could find with a quick check. Also, here are the release notes:
ROM files can now be deleted when deleting games
Region information is now parsed from ROM file names
Big Box now has an option to skip the game details screen
Hoping to put out the release in the next few days if we can. Thanks guys. :)