chore: [IOAPPFD0-29] Add Slovenian localization

[dmnplb]

Short description

Thanks to the valuable contribution by @damjang, this PR enables the Slovenian localization in the IO app.

List of changes proposed in this pull request

• Move the entire original sl folder (from the previous PR) to the new updated environment.
• Add the various locale settings to the codebase, according to internal guidelines

How to test

Go to the Profile → Preferences → Language → Select Slovenian

[pagopa-github-bot]

Affected stories

• ⚙️ IOAPPFD0-29: Aggiunta della localizzazione in sloveno

Generated by 🚫 dangerJS against b65ae6b

[Vangaorth]

@dmnplb I applied the content of this PR to the one with the slovenian translations. Both this and that require additional work for the remote generated file that does not have support for the language.
Do you prefer to keep this PR in draft/open mode or is it closable?

[damjang]

Hi to all! Thank you for working on the Slovenian translation. If I can help with something -but not with coding-, please tell me.

[dmnplb]

@dmnplb I applied the content of this PR to the one with the slovenian translations. Both this and that require additional work for the remote generated file that does not have support for the language. Do you prefer to keep this PR in draft/open mode or is it closable?

Let's close this PR in favour of the @damjang's one, so we can keep the correct authorship of the changed lines. We can continue the conversation in the original PR.

@damjang, thanks again for your contribution.