Indicate expiry of team invitations

[comradekingu]

Describe the issue

An invite for 30 dec is no longer valid 10 feb, but it doesn't say so in the generated e-mail.

I already tried

• I've read and searched the documentation.
• I've searched for similar filed issues in this repository.

Steps to reproduce the behavior

1. Be invited to be a "power user".
2. Miss the e-mail
3. Click it much later
4. Dangit

Expected behavior

Would expect maybe one follow-up e-mail, and for them to state expiry.
Not sure these have to expire?

Screenshots

No response

Exception traceback

No response

How do you run Weblate?

weblate.org service

Weblate versions

No response

Weblate deploy checks

No response

Additional context

No response

[nijel]

These do expire and the expiry should be mentioned in the e-mail.

[github-actions]

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