resolve: add parenthesis around "no more unresolved files" message

This message may be confused with an error message. Adding parenthesis around it
will make it more recognisable as an informative message.
i18n: add parenthesis in Brazilian translation of the resolve message

Eu falo brasileiro agora. Eu não sou uma batata!
graft: add a reference to revsets to the help text (issue3362)