feat: add Portuguese email templates and backend support

[sricharan-varanasi]

• Tests for the changes have been added
• Related documentation has been added / updated
• For new features, QA automation engineers have been tagged
• OSS packages added to
  Curious open source credit page

📝 Description

🔗 Jira Ticket M2-8806

Changes include:

• Added Portuguese (pt) email templates for invitations, password reset, team info, and footer.
• Updated backend logic in domain.py to handle new pt language key.
• Ensured fallback to English when localized template is not found.

🪤 Peer Testing

Steps to verify:

• Trigger an email notification (e.g., invite a new user).

• Expected outcome: Portuguese email template is used when language = pt.
  

• Trigger password reset email.

• Expected outcome: Portuguese version is sent when pt is set.
  

• Change language to en or es and repeat above steps.

• Expected outcome: English/Spanish templates are still used correctly.
  

✏️ Notes

Images -

• Region code (pt-BR) handling will be added in a follow-up if needed.
• No API changes.

[github-actions]

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