Update it web translation for 3.9.0

[gilgongo]

Hi @dzpex,

We are getting ready for the 3.9.0 release and have created the next-release branch (full diff).

We would be happy if you updated the translations for it by 2022-07-22.

Please

• Start your work in your fork on a branch based on jamuluswebsite's next-release branch.
• Update the language-specific files using your favorite editor (or directly on Github),
• New/changed images are listed at the end of this issue. Generate new URLs for your image .inc files.
• Commit and push your changes to your fork,
• Open a Pull Request with your translations to the next-release branch with the subject Update it web translation for 3.9.0,
• Link your PR(s) to this issue by including Fixes #777 in the PR content.

Suggested commit and PR message:

Update it web translation for 3.9.0

Fixes #777

Feel free to use this Issue to discuss anything you need prior to making any PR (and in your native language if needed).

Further documentation can be found in TRANSLATING.md.

Thanks for contributing to Jamulus!

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New/Changed screenshots:

Please replace with new URLs for your screenshots here, and use those URLs in your .inc files.

[ignotus666]

Please note that the documents "Include-QOS-Windows.po" and "Server-Linux.po" do not need translating as they have been removed from the documentation (though did not get removed from the PO folders). However, some of their content has been moved to other documents so it would be good if you update your translation memory to take advantage of any strings that had already been translated.

[pljones]

Removing from Release 3.9.0 - this can be completed after the release.

[gilgongo]

Closing as past deadline.