....

Annexed to the Kingdom of Italy after the WWI, with the Peace Treaty of 1920.
After WWII. in 1947 became Jugoslavia.
Now it's in Slovenia.

With the present law Italian citizenship iure sanguinis (since birth) is limited to two generations of the Italian emigrated.
In a few months the Corte Costituzionale will decide about the law, there may be changes.

First verify that all data are correct;
the husband was not Italian?
Why did they marry in Udine?

Ask a "copia integrale" to be used to ask recognition of Italian citizenship .
The document should be sent without any payment,
by e-mail, if you want it in paper, sent by mail, it may be more ...

In (good) Italian r and l are two well different sounds

It is the English r. that, according to linguists,
should be a bit different from the Italian

PM ricevuto, ringrazio ancora.

Buonasera
Per cortesia, chiedo se qualcuno potrebbe trascrivere il testo latino di un antico atto di matrimonio.
.
https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSL6-7SDR-G?view=explore&groupId=M96F-FN5&lang=it
.
Questo link a Family Search porta a una immagine (n. 16) di una raccolta di atti ...

It seems the consulate doesn't want to certify translations not to be used in the same consulate.
In general translations should be made in the Country of the document.
So, if in the US there are registered translators who can do these work I think it will be OK.
Otherwise yes, you may do the ...

For the last question:
the date of the document
1-7-43-XXI means 1 July 1943 , year 21 of the Fascist Era;
the war is the II WW

Please note that with the new law of this year it's no longer possible to be recognized Italian citizen by "1948 case".
(unless you have already begun the process, but in this case you should have already given all papers to your attorney).

No.

I read this old post.
The fact that the minor child was considered having lost Italian citizenship together with his father was not due
to the opinion of a single judge, but to a sentence of the Corte di Cassazione which gave a new interpretation of the law of 1912 (not written very clearly), so ...

The person died on 14 Oct. 1944 in sant'Angelo Lodigiano, this is the transcription on the register of Milano, made in 1945, of the original death act, as she was resident in Milano.

There are not complete lists of Italian prisoners in the UK.
But you may ask the
British Library customer@bl.uk
if they can find any info anbout your grand-father.
_____
In Italy you may ask a search at the Archivio Centrale dello Stato
(tell me if you need help)

https://acs.cultura.gov.it ...

The new law gives Italian citizenship iure sanguinis (from the birth) to a person born abroad and with another citizenship only if a parent or grand-parent has/had ONLY Italian citizenship (at the date of birth of that person)
So in your case, it's not possible from your grand-father as he had two ...