31ffbc8ae4
The cancelInvitation dialog type fell through to the generic
t('userManagement.cancel'), colliding with ConfirmDialog's own dismiss
button -- two buttons both reading "Cancel", where clicking the wrong one
does the opposite of what the user intends.
Reuse the existing userManagement.cancelInvitation key: "Cancel Invitation"
vs "Cancel" (EN), "Einladung abbrechen" vs "Abbrechen" (DE). No new key.
Refs testplan REPORT.md #19 (Part 3, I.04).