Add Polish UI translations

[kpodurgiel]

Description

This PR adds Polish translations and fixes one minor typo in the i18n schema.

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I've been on a fence with a few translations, here's what I am choosing and why:

• search.shortcutLabel: (Naciśnij /, aby wyszukać) – the comma after the slash looks weird, but that's the rule in Polish. I've been thinking about:
  • Naciśnij / i szukaj ("Press / and serach"), but it's not better, as there are two single characters next to each other.
  • Aby wyszukać, naciśnij / – I can't tell if it's less or more visually annoying, and it sounds weird. It also conveys the meaning later in the sentence.
• search.devWarning: uruchomić aplikację literally means "run the app". "previewing the site" doesn't translate well, and I think it could cause confusion.
• page.previousLink: I added "page" to the word "Previous", as in Polish we decline adjectives according to nouns they go with, and leaving just "Poprzednia" / "Poprzedni" / "Poprzednie" implies the gender anyways, and it's rather rare to see it on the Polish websites. The same goes for nextLink.
• aside.danger: That was the worst to translate, because direct translations of niebezpieczeństwo and zagrożenie are both strongly charged words (prime definitions regard a threat of hurting or offing someone), so I went with "ważne" – "important", which I've seen in other wikis to be used for aside red sections as well.

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Latest commit: e428d23

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[HiDeoo]

Thanks for your contributions 🙌 I really appreciate you taking the time and explaining the translations that were a bit tricky and the decisions you made.

As a non-native speaker, this looks pretty good to me. I only left a few questions just to make sure that some translations are indeed expected to be identical to the English version.

Note that when approved, the PR will only be merged before a new version is released so that the documentation is only updated when the new language is available.

[kpodurgiel]

Okay! I've accepted the comment which added \n. The rest is correct. Many thanks for the review.

[HiDeoo]

Thanks for fixing the line ending issue and taking the time to go over all my questions 👍

Approving now so it's ready to merge when the next release will be going out.

[delucis]

Thanks for adding these @kpodurgiel and thanks for the thorough review @HiDeoo 🙌