Make clean-up with inactive user

[EwelinaSkrzypacz]

So, we have some little inconsistency with inactive employees.
For example:

• on calendar view I don't see inactive user
• but on vacation requests list I can see his vacation requests (but on users filter inactive users are not shown)
• on vacation limits page I also see inactive user limit

So, after speaking a bit with Kamila, we think that we should by default hide all information about inactive users, but we can make some checkbox for example "Show inactive users vacation requests" and on vacation requests page we can see also inactive user requests, but records have gray background or something.

And we should change toast text, when admin click on user and click option "Zablokuj". Now we have "Usunięto użytkownika", but this is not entirely true, because all his information is in database. We can change it to "Dezaktywowano użytkownika" or "Zablokowano użytkownika".