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Hi !
I'm the author of the multilingual hack for xcGal. What is happening is really normal
You see, the hack for xcGallery multilingual does only contains the files that were modified to make this module multilingual. It does not contain all the module files. This is why you get something like Module File Not Found. You need first to install the complete module, then copy the Multilingual hack.
But as you said on your post, you don't need multilingual functionnalities, so you only need to download the complete module.
You can download xcGallery here, along with some language packs :
xcGallery - DownloadsHope this helps !
Cheers !