Bugfix: Always use the default language when generating emails.

What does this MR do?

It makes the application use the default language when generating emails.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Some emails were being generated in a language that was foreign the the target user.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #32748 (closed)