Re: @Antynatalista:
You really sure that Google still has not learned to translate from Russian to your Slavic language? Well, i can make a new translation variant "cyrillic -> latin", though I'd recommend you to learn cyrillic alphabet, it just takes takes half of hour.

Cyrillic -> Latin transliteration
do we need it ?
I expect confirmation from you. I wouldn't want to do useless work, but if there exists at least one user who will use it, I'll do it

Re: @trespassersW:
You really sure that Google still has not learned to translate from Russian to your Slavic language?

I am bit sadomasochistic. I don't like Google Translate. I still think they develop it mostly for any language-> English. I think for the rest languages this service isn't still so good (I mean for example Russian -> my native, slavic language).

My thought process is as follow:
The problem is that I can understand Russian language (when I hear it) up to 50%.
I am native of slavic, but latin (in letters) language.
So at the beginnig I want to have latin letters (from Russian).

I think 60% foreign students of Russian "resign" when they meet the Cyrillic (this different letters are the problem).

Thank for help anyway

[Re] @Antynatalista:
Well, I wrote a function for cyrillic -> polish transliterating.

javascript:function rulat(s){
const rabc={
 'а':"а", 'б':"b", 'в':"w", 'г':"g", 'д':"d", 'е':"je"
,'ё':"yo", 'ж':"ż", 'з':"z", 'и':"i", 'й':"j", 'к':"k"
,'л':"l", 'м':"m", 'н':"n", 'о':"о", 'п':"p", 'р':"r"
,'с':"s", 'т':"t", 'у':"u", 'ф':"f", 'х':"ch", 'ц':"c"
,'ч':"cz", 'ш':"sz", 'щ':"szcz", 'ъ':"`", 'ы':"y", 'ь':"'"
,'э':"e", 'ю':"ju", 'я':"yа", 'А':"А", 'Б':"B", 'В':"W"
,'Г':"G", 'Д':"D", 'Е':"Je", 'Ё':"Yo", 'Ж':"Żh", 'З':"Z"
,'И':"I", 'Й':"J", 'К':"K", 'Л':"L", 'М':"M", 'Н':"N"
,'О':"О", 'П':"P", 'Р':"R", 'С':"S", 'Т':"T", 'У':"U"
,'Ф':"F", 'Х':"Ch", 'Ц':"C", 'Ч':"Cz", 'Ш':"Sz", 'Щ':"Szcz"
,'Ъ':"`", 'Ы':"Y", 'Ь':"'", 'Э':"E", 'Ю':"Yu", 'Я':"Ya"
};
for (var c, a=s.split(''), lat='', k=a.length, i=0; i<k; i++)
 lat+=(c=rabc[a[i]]) ? c : a[i];
return lat;
}
document.body.innerHTML=rulat(document.body.innerHTML);
void(0);

You can use it in userscript, or you can create a Bookmarklet containg this code.

Ok, thanks. I will tackle this script in the following days. "Programming" is for me like a rocket science at the moment.

[Re]@Antynatalista:
I've made userscript called RuLat_translit that works on all sites in .ru domain.

Hope your knowledge of programming will be enough to correct this script's conversion table rabc in accordance with your enigmatic Slavic language