This comes up sometimes, but fewer people are asking as time goes by so you might want to search the forum to see what you can find. If I remember correctly, you want to have the PageMaker files saved in the latest version of PM7 (I don't remember the update number), so if you still have PageMaker on an operating system that will run it, you may (or may not) need to save-as before you convert. Also, any images should be checked for current links (best to link and not embed images before the conversion. Lastly, it may be that you need to take the files through a few versions of InDesign, rather than opening them directly in CC. That's just a guess, because I haven't touched PageMaker or it's files in many years, but older threads on the forum might confirm that.
As far as the language goes, you will want to hear from the forum's language experts on that, and I'm not one, so I can't help you there.