I'm a bit baffled by "Cannes". How else would you say it except "can" or "cans"?

I don't think I've ever heard an English speaker pronounce "Istanbul" right unless they'd been there. (The stress is on the second syllable).

If "Madjorka" is to be deprecated, which pronunciation do you want to replace it with? The Spanish one, the Catalan one, or the Mallorcan dialect one (which I don't know but I presume is a bit different from mainstream Catalan)?