i18n(fr): improve the wording in server-islands & syntax-highlighting

[ArmandPhilippot]

Description (required)

Updates the French translations of guides/server-islands and guides/syntax-highlighting based on the French i18n guide update:

• reword some parts to match the English version
• fix typo
• replace support with pris en charge
• replace barrières with délimiteurs
• replace styliser with mettre en forme
• replace the translation for inline styles/inline code
• replace package with paquet

Related issues & labels (optional)

• Suggested label: i18n

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Tracked Files

File	Note
fr/guides/server-islands.mdx	Localization changed, will be marked as complete.
fr/guides/syntax-highlighting.mdx	Localization changed, will be marked as complete.

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.

[dreyfus92]

Thank you @ArmandPhilippot, LGTM 🫡