I hope you don't speak Serbian and you don't learn it in school because you wrote:
Welcome to trembling!
...
I think I better not translate the rest because it is a killer
!
Ok this is what it says:
Hello brother! I am from Serbia (Serbia and Bosnia are side by side) and I am glad to see people that speak Serbian! (This is hard to translate) Big hello to you and continue to drive like that!
Hope my English don't suck!