I don’t know why you would feel that way.
If I’d be the father of a cute little puppy and evil modders would poke its eyes out with their pointy sticks…
I still wouldn’t care. Because I still have my pristine clone of that very same puppy 
Currently it’s not easily possible to add additional languages without releasing new builds of the game.
With some code changes it would be imaginable to implement auto-detection of available languages (e.g. by checking for ThimbleweedText_* files and using fixed line IDs for voice/text language).
This would make simple text-based translation possible.
One complex issue is the translation of pictures since they are embedded into existing resources and cannot be easily extended.
Additional changes would be necessary to e.g. load language specific parts of a sheet from separate image files. This way there would be no need to modify existing resources and multiple translations could co-exist.
Currently the only suitable way I know of is to chose an existing language and overwrite its assets.