Language pack doesn't apply?

I have LibreOffice 6.0.1.1 installed on Lubuntu 17.10. Since the default user interface language is english I have downloaded my language pack, which it contains 3 different .deb

libreoffice6.0-dic
libreoffice6.0-
libobasis6.0-

and it’s supposed to change the user interface language.

I have installed all of them manually with dpkg, however only English displayed in the user interface module. How can I solve this?

What do you mean under user interface module?