Establishes the ui.* namespace for phases 2 and 3. Both catalogs complete, so the key-parity test holds. Two English copy defects fixed while keying, because the Portuguese must not inherit them: 'Your are not authorized' -> 'You are', and 'Please Signin again' -> 'Please sign in again'. The server's own message in ServerError/CustomError stays verbatim — it is a response, not UI copy (D1).