Properly translated invitation and account emails

Team invitation, one-time password, and account-deletion emails now arrive fully translated — including Polish and Ukrainian — instead of showing placeholder text.

Some of our transactional emails — team invitations, one-time passwords, and account-deletion confirmations — could arrive showing internal placeholder labels instead of readable wording.

These emails are now fully translated and render correctly, with Polish and Ukrainian versions added. Any email sent in a language we haven't translated yet automatically falls back to clear English wording rather than placeholder text.