The find counts, toggles, replace buttons, the builders' add, join and direction labels, the filter tests and the password tooltip read the builtin catalog. Test::label becomes Test::key, the choice's value; its label is the catalog's. The shipped-copy scan checks button, segment and match-arm text on every match, and zh-CN render tests cover both. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>