Italian language update

[bovirus]

@sdottaka

- Shell translation (100% translated)
Complete Italian tranbslation for shell extension

- GUI translation (100% translated)
Complete Italian translation for GUI

- Inno Setup Installer scripts
Add Italian custom strings

Please merge. Thanks.

[sdottaka]

Thank you!

[bovirus]

@sdottaka

In this web page https://winmerge.org/translations/

could you plrase add my nick (bovirus) at Italian translator?
could update thr translation statistics about languages (latest update was 27.01.2024).

Thanks.

[sdottaka]

The information in the above URL is created from the header section of the Italian.po file.
I added your name in commit 72196dc.
It will probably be reflected in the next stable release (2024-4-27),
You can also check the URL below.
https://github.com/WinMerge/winmerge/blob/master/Translations/TranslationsStatus.md

[bovirus]

@sdottaka

Please modify python

https://github.com/winmerge/winmerge/blob/master/Translations/GetTranslationsStatus.py

to get date for Shell Extension italian language
to get info from Inno Setup Custom Message file (and add Italian translation line for custo messages translated at 100%)

I propose to change the header of tramslation status

WinMerge -> GUI
Inno Setup -> Inno Setup Custom Messages

Thanks.

[sdottaka]

I'm not familiar with Python so any PR would be appreciated.