This patch replaces domain of mercurial-devel ML address by
mercurial-scm.org for "Report-Msgid-Bugs-To" property of each *.po
files.

This avoids releasing 4.1.1 with invalid "Report-Msgid-Bugs-To"
in *.mo file, if corresponded *.po file isn't msgmerge-ed with recent
hg.pot by translator.

These *.po files aren't covered by check-code.py pattern newly added
in subsequent patch, because it ignores them.