I will try another one of yours - Belarusian is much harder to translate into (since I was much less exposed to it) but I don't know if we have native speakers with a good command of Belarusian here:Can somebody help me translate this into Belarussian?
I also need to say: How is life in Belarus these days with Bat'ka Lukashenko?
There are several variants of spelling and I think it will take some time for one version to prevail completely. This chaos started when the country became independent and its name was changed from Byelorussia to Belarus. "Byelorussian", quite undersandably, is strongly assosiated with the Soviet times, so I wouldn't use this one. Belorussian and Belarussian are still used frequently, but Belarusian [bela'rusj@n, bela'rushn] and Belarusan gather momentum. The advantage of the two latter forms is that they comply with the country's name and, apart from that, they don't evoke immediate assosiations with Russian.Although confusing, I think the correct modern spelling is "Belarusian".
BTW, I noticed, Belarusian is often written incorrectly on the web, there is not much literacy on the web in this language.