I'd send you my updated files, but I've also made other changes... If I remember or see anything else I'll post it up for you.
Yeah the infobox corners really does need to be in the templates/templatename/images folder, for portability. Would be nice to do the same with the buttons I guess, but then you need to change the whole languages structure. Might get a bit confusing, cause then all the languages wouldn't be "kept togehter".