merge with i18n-stable

i18n-pt_BR: miscellaneous fixes

i18n-pt_BR: synchronized with 2de7d96593db

config: improve code readability

mq: re-phrase the qrefresh help about the user and date options

mq: add the date with qrefresh, even if missing (issue1768) When setting the date with qrefresh (-d|-D), and the patch does have neither a 'Date:' nor a '# Date' header, add the date field as such: - if the patch has a 'From:' header, add a 'Date:' header - otherwise, upgrade to Mercurial extended patch format and add '# Date'

mq: upgrade the patch to HG format when adding the author name with qrefresh When setting the author field with qrefresh (-u|-U), and the patch does have neither a 'From:' nor a '# User' header, add the author name as such: - if the patch has a 'Date:' header, add a 'From:' header - otherwise, upgrade to Mercurial extended patch format and add # From

mq: add function to check if a header exists in a patch