It's Russian. Cute.
Okay, not funny for you.
single.php template files, search for this:
After that you will see a bunch of character codes. They are the letter equivalent of Russian alphabet. Categories look like "Категория: " on the screen but in the code they look like this:
followed by the link to the article and it's title. Delete those characters and replace them with whatever you want it to say, which normally should be "Categories:".
For the "Коментари", look under the
feedback class that looks like this:
<div class="feedback" align="right">
And you will see a link to the article's comments and the same bunch of character codes as above. Carefully change those to "Comments" in English.
And welcome to the world of bilingual WordPress Themes. It's actually charming. BUT annoying, I know. ;-)