docs: i18n improvements

[HiDeoo]

Description

This PR implements tiny i18n related improvements for the documentation:

• Removes the slugToLocaleData() internal dependency in the languages list component in favor of using Astro.currentLocale.
• Adds a translatable "copied" label to the icons list as discussed in i18n(fr): add reference/icons #2343 (review)

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Tracked Files

Locale	File	Note
fr	reference/icons.mdx	Localization changed, will be marked as complete.
en	reference/icons.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[HiDeoo]

This uses the same data structure used in the theme editor for labels which would be nice in case we ever need more labels in the future altho I guess an argument could be made to use a flat string property instead of an object in this case.

[HiDeoo]

Duplicated with the component default label but marks translations as outdated.

[HiDeoo]

The "copied" label is added only once to the DOM and not for every icons.

[delucis]

Perfect. We could even delegate the click handling here too I guess to avoid assigning a listener for every button? Doesn’t have to be in this PR though!

[delucis]

Looks great! Tested a few pages including ones with fallback content and everything seems to be working as expected. Happy we can get this content translated properly too 🙌