Hey, not sure if you take contributions for an entire mod instead of translations to different languages, but I was getting bothered by the inconsistent sorting in an unsupported mod and your file structure was extremely easy to understand.

I created a sorting mod for all the Gun Parts, Gun Attachments, Ammo, Magazines, and Firearms in "Guns of 93 (B42 Test Build)" as of today. Works fine in my game so far with the exception of a handful of weapons which would need completely new categories because they don't match any of the existing ones. I included the English IGUI translation lines for those in a comment at the top of the file, but even editing IG_UI_EN.txt I can't seem to get them to parse correctly.

The calibers seemingly unique to Guns of 93 are as follows:

• .25 ACP
  
• .30-30 Winchester
  
• .30 Carbine
  
• .380 ACP
  
• .40 Smith & Wesson
  
• .45 Colt
  
• 7.92x57mm Mauser

The three bolded ammo types are completely unique to one specific gun as a bit of an easter egg, and so rare that I'm not sure if it makes sense to give them a whole category when they'd be the only thing ever sorted into it. There's an argument for it looking nice in general though, to identify the ammo type of a gun even if it's weird.

The full text of the file itself is pretty significantly sized, so I put it on pastebin
here[pastebin.com].