Is it possible to change default language of web interface ? I used to use polish as default language. But some time would be good to know what is the source of message/sentence/word 
hey @krzys128 welcome to the forum!
We have 2 different instances where the language is set:
- Default for new accounts is set in the Administration workspace under Internationalisation
- Your specific account is set by going to your profile and clicking the edit button, there will be a language option there
Generally Iād recommend just changing it in your profile if you are just doing a quick check on what it was translated from
pretty easy to change
thanks for a quick hint