Add language Italian

[MatteoGheza]

I'm working on adding the italian translation, to both src/legacy/dev-application/languages/en.php and src/legacy/languages/en.php.

[nebojsatomic]

@MatteoGheza Thank you for participation, but at the moment, only work on src/dev-application/languages/creator/it.php by updating the current translation, if some strings are not translated properly,
or add src/dev-application/languages/it.php file, copy and paste the contents of sr.php from the same folder, and translate in that file.

Do not touch src/legacy/dev-application/languages/en.php and src/legacy/languages/en.php.
you have the translation guide already written in repo's Readme.md

[nebojsatomic]

@MatteoGheza feel free to contact me on linkedin
also, did you check the it.php file in creator folder? are all the strings translated properly?