Add Plautdietsch (pdt) language

[starsep]

Describe the problem

I don't see Plautdietsch (pdt) language in https://hosted.weblate.org/new-lang/openaedmap/website-translation/
https://en.wikipedia.org/wiki/Plautdietsch

Describe the solution you would like

Is it possible to add it?

Describe alternatives you have considered

No response

Screenshots

No response

Additional context

No response

[github-actions]

Thank you for your report; the issue you have reported has just been fixed.

• In case you see a problem with the fix, please comment on this issue.
• In case you see a similar problem, please open a separate issue.
• If you are happy with the outcome, don’t hesitate to support Weblate by making a donation.