Russian controlled "respublika" plague even more
You do realise that it's the Russian Federation in official language, don't you? Russia has never been a republic - and the republics that make up the Russian Federation are autonomous only in name. If anything, you want to blame France, not Russia.
I think they should've used Rzeczpospolita for the Polish speaking population and Commonwealth for the English speaking world, why do they have to use the same term everyone else is using?
Commonwealth is hardly unique either (Virginia, Kentucky, Dominica, Australia, et al) - and really, in English, is used more when a State doesn't have full independence. It would also be incorrect - Poland is Poland, it's not made up of autonomous constituent parts, nor is it part of something bigger.
Don't forget - "common wealth" also has undesirable socialist tones.