The webmail half of inbuxa's DLP (dlp-and-mail-flow-rules spec, §2.5,
§4):
- A send the server's DLP rules refuse (inbuxa:dlpWarning or
inbuxa:dlpBlocked) comes back to the composer with the rules' notices
instead of a generic "Send failed". A warning offers "Send anyway…",
which asks for a reason and sends again with inbuxa:dlpOverride; the
server records the reason. A block can only be answered by changing
the message.
- A message DLP held for review says so on sending ("Held for review:
it's sent once a reviewer releases it"), from the submission's
inbuxa:held.
- Tests: the override travels with the submission only when there's a
reason; refusals are told apart from other errors.
Nine new English strings (the notice labels, the prompt, the toasts);
the other catalogs fall back to English until translated.