I did what you mention 22 years ago when I was 16, to create an “Italian version” of BASIC. I just chose suitable analogues in Italian for all the various keywo

I did what you mention 22 years ago when I was 16, to create an “Italian version” of BASIC. I just chose suitable analogues in Italian for all the various keywords and fed it through a glorified Find/Replace script before handing off to the QBASIC interpreter. Of course Italian’s pretty strict word order helped a bit.