That's the reason I always use the English version of everything. What I find most ridiculous is when hotkeys get translated, ex. Ctrl+S is Underline in Spanish (Subrayar)

It never occurred to me that other languages would have different hot-keys. Intuitively it makes sense, but damn I imagine a lot of programs don't do it so it must be a horribly inconsistent experience (I get angry when a program fails to support something like CTRL-W to close windows or CTRL-A for select all or the inconsistency between some using ctrl-shift-Z or ctrl-Y for redo).

I guess that's the advantage to the old Word Perfect approach of function-keys for everything (provided you have one of those nifty overlays that show you all the key-commands).

And it makes auto completion useless. You type 'SU' and stare the screen "WTF?". Oh, this Excel is in PT-BR! 'SOMA'

And they even change conventions. "SUMIF" must be "SOMASE", right? Wrong, in PT there's a "." between words, so it's "SOMA.SE"...

Not only PT, that happens in most languages where the dot is not the decimal separator. It might have been the case in English as well if they used commas.