Translation of words

Technical Details

Forum version : #phpBB3
Position : Founder
Concerned browser(s) : Opera
Screenshot of problem : https://imgur.com/a/KtsLw
Who the problem concerns : Yourself
When the problem appeared : since the beginning
Forum link : http://vantharia.forumpolish.com

Description of problem

First of all you have know that im from Poland. So my problem is that while i have chosen polish language for my forum many of words are still in english, as you can see in this picture i send. My question is: how can i translate all of this to my native language? Is there a way to do this? I don't want my forum to be half english/half polish.

We do not have access to the database, so you will not be able to translate the words.

What exactly is not translated?