Not so much a language problem, but probably a more general problem with accented characters.
Since Ableton lives in Germany (rather than an English-speaking country), they ought to be aware of the problems in using accented characters. But we still have some objects (not necessarily from Ableton, but from all sorts of places) that have problems with characters beyond old-fashioned seven-bit ASCII. So, unless you can give us a specific patch with your specific problem, that's the first guess.
Off hand, the first workaround I can suggest is to avoid using accents. I realize this is not good for Portuguese (nor for German, French, nor almost any other language). But maybe it will at least get your patch to work?