Updating author guidelines (FR and PT)

[anisa-hawes]

en/author-guidelines.md and es/guia-para-autores.md have been updated to reflect recent revisions to the Lesson Maintenance workflow.

This PR will publish FR and PT translations on fr/consignes-auteurs.md and pt/directrizes-autor.md.

Closes #2210

Checklist

• Assign yourself in the "Assignees" menu
• Assign at least one individual or team to "Reviewers"
  • if the text needs to be translated, assign the relevant language team(s) as "Reviewers" and tag both the team as well as the managing edtor in your PR. Please follow the translation request guidelines when writing your PR description
• Add the appropriate "Label"
• Ensure the status checks pass
• Check the live preview of your PR on Netlify
• If this PR closes an open issue, add the phrase Closes #ISSUENUMBER to the description above

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[anisa-hawes]

Thank you @DanielAlvesLABDH!
Thank you @spapastamkou!