feat: add French language support

[aginies]

Would be nice to have it also in French.

[fmaclen]

@aginies thanks for submitting the PR, this works so far but you are missing a few more changes:

• Needs to update src/routes/settings/Interface.svelte
• Needs to update src/routes/+layout.svelte
• Needs a new test in test/locales.test.ts?

For reference, here's another PR for a recent language addition:
#241

[aginies]

@aginies thanks for submitting the PR, this works so far but you are missing a few more changes:
....
For reference, here's another PR for a recent language addition: #241

Thanks for the reference.
I fixed the missing part. Should be OK now .
regards.

[fmaclen]

Thank you for making those extra changes 👍

[fmaclen]

🎉 This PR is included in version 0.26.0 🎉

The release is available on GitHub release

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