Some language issues

Hello, I love the theme but I came across several issues. I translated it using Poedit and it works really fine, except for the word “comments”. Although I put my own word in the .po file (as I did with other English words which now are in my language), I still see “comments”. Why is that?

And the second thing – there are some elements which should be translated as well but I cannot find them in the .po file, such as “Search” when you click the search button or “Next”/”Previous” on the page when you’re viewing eg. the archives. How to translate them?