Now another translator in Japanese moodle!!

I'll release this version in about 8 hours, just in case any of the
translators want to translate these release notes.

last) and stops checking if a match is found.

#1929. First stage XHTML conformance.

because generalcomment and teachercomment were not null and didn't have defaults.
for some reason mysql allows this but postgres complains. I've set empty string defaults and added into mysql for consistency.