object.isolate's errors "type objects can't be isolated", "the object
is hidden or locked" and "missing id" had no row in any catalog, so the
status bar showed them in English in every language. The same was true
of layer.target's "the object is outside the isolated group", the other
isolation-mode error in the commands.
Each of the four messages now has an @msg row in every catalog that
translates all status and error messages and in Bulgarian, Danish,
Indonesian and Dutch. layer.target also gives "the object is hidden or
locked", and several other commands that take an id also give "missing
id", so the same rows translate those errors.
Docs: docs/target-app-parity.md.