CIP-1694 | Adding French translation (#539)

* CIP-1694 | Adding the french translation.

Each line has been meticulously translated into French and we are committed to keeping it up to date.

* Replace preamble and rename to README.fr.md

- Renamed with a new suffix on the file basename using ISO 639-1 language code.
- Replaced the preamble by the one suggested by @KtorZ

* Update CIP-1694/README.fr.md

Co-authored-by: Matthias Benkort <[email protected]>

* language fix for "title" vs. "titre"

* Replace CIP for Source in preamble

* restoring CIP number after commit 1354fa0

* Fix machine-readable keys and syntax

- Updated machine-readable keys back to its original language.
- Corrections of the bad syntax of machine-readable keys.

* using 7-figure commit hash - see #539 (review)

* ratification requirements link missed translation

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Co-authored-by: Matthias Benkort <[email protected]>
Co-authored-by: Robert Phair <[email protected]>