1.
Byłoby wspaniale, gdyby ktoś mógł dla mnie zrobić pliki nowej prowincji Watykanu. Chcę, żeby Watykan był W Rzymie, nie obok Rzymu. Potrafię stworzyć nowy state, dodać strategic region, ale nie umiem utworzyć nowej prowincji.

It would be great if someone could make for me files of new province Vatican. I want Vatican to be IN Rome, not next to Rome. I can make new state, add to stategicregion but I can't make new province.

2.
Nie wiem czemu, ale na prawie całej szerokości drzewka pojawia się połączenie między celami, które nie łączy niczego. Jeśli ktoś znajdzie czas, żeby przejrzeć kod i wyłapie coś czego ja nie zauważyłem, to bardzo proszę mnie poinformować.

I do not know why, but on almost the entire width of the tree there is a connection between focuses that does not connect anything. If someone finds time to look through the code and catch something that I didn't notice, please let me know.

3.
Jak zmienić nazwę państwa przez focus?

How to change name of country using focus?

My fellow polish friend, I believe you can use cosmetic tags as completation_reward = { set_cosmetic_tag = ITALY_democratic } and then in localisation files write ITALY_democratic:0 "Republic of Italy". Are you planning on making a mod for poland or other countries? l Also have a mod reworking Portugal on the Workshop in case you want to check it out (Portugal reworked++ expanded).

On Steam is really good mod for Poland - Poland+
I want to make later mod for Yugoslavia and all countries like Croatia, Serbia, etc

I tried use set_cosmetic_tag, but I'll try again

I wish I could send you a picture of how I have it in my mod but that´s the way to do it as far as I´m concerned, make sure you edit the localisation file as well. Do like this:
completion_reward = {
set_cosmetic_tag = POR_masonic_portugal

and then in localisation: POR_masonic_portugal_neutrality:0 "Enlightened Portugal"

Edit: I know what happened! In my previous comment I put _democratic but that´s only in localisation, I hope I was able to help! Oh and also try to use italy´s tag, almost forgot