We tried that in the 1980s with MS/PC/DR-DOS and code pages. We also had BBS networks where people shared such files around the world. One language per file turned out to be a bad idea.

... might sound like a reasonable solution until you start trying to write about languages. It is unreasonable for a sentence like "In Japanese, the word for 'hello' is こんにちは; in Korean, it's 안녕하세요." to be unrepresentable.