Since the translation system from WinMerge 2.x doesn't support cross-platforms we need a new one.
If we really use Qt as GUI framework, we should use their I18N functions:
kimmov : Translation system we use in the code and one we offer to translators does not need to be the same. Yes, in code we definitely will use Qt's system. But looking from translation resources and tools PO(T) files are much better choice for translators. And there are tools for conversion. I'm not saying we must use PO files, just saying it is still an option.