By the way, the only completely programming language with localized keywords that was intended completely seriously is Excel worksheet functions and macros.

I think Algol 60 (and AFIK Algol 68) would count here too. In the Algol standard, the actual graphical representation of the keywords was left implementation independent, and I remember having seen at least one Algol 60 using German keywords (i.e. WENN instead of IF).