Request for string freeze exception in release/21.08/PIM

[Friedrich W. H. Kossebau]

Hi,

we found 2 bugs in PIM code which for consistent fixing each need one new UI 
string for reporting a potential related error.

See
https://invent.kde.org/pim/kmail-account-wizard/-/merge_requests/4/diffs
https://invent.kde.org/pim/pimcommon/-/merge_requests/5/diffs

The error is rather unexpected, so no-one might ever see the string, but safe-
over-sorry.

Are you okay with adding those two string?

Cheers
Friedrich