Language settings

Hi,

I’m working to update my website. The page language is polish and the issue I’m struggling currently with is that there are some english words in theme I’d like to remove or translate. Unfortunately have no clue how to do it…

What exactly I have meant above:
– read more – in blog grid as well as on the main page (see i.e. http://www.marcinozog.com/test/historie-slubne/) – I’d like to translate it. Couldn’t find it though anywhere…
– date is in polish language, but before it there is english “on”. How to remove it?

Thanks in advance.

The page I need help with: [log in to see the link]