language pack doesn't install

I’m using a MacBook pro touch bar. I had to install LibreOffice 5.3.5 for school but its language is English. I want to change it to Finnish because I don’t understand English very well. I installed the Finnish language pack but when I click the LibreOffice icon, it loads a bit and says it failed. This happens every time. What can I do?

First, reset your user profile and see if that helps.

I reset it and nothing happened. It still says it failed

And if you uninstall the language pack?