feat: add legal mentions page and update terms page with localization

- Created a new LegalMentionsController to handle the display of legal mentions.
- Added a new Blade view for legal mentions with localization support.
- Updated the terms page to use localized titles.
- Updated footer links to use localized text for legal mentions and terms.
- Added French localization entries for "Mentions légales" and "Conditions générales de vente".