docs: add French translation of internals/credits.mdx

[webdevbynight]

Summary

Add the translation into French of the credits page.

Added:

• the internals/credits.mdx file translated into French.

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Tracked Files

Locale	File	Note
fr	src/content/docs/internals/credits.mdx	Localization added, 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.