More info: http://help.transifex.com/features/client/index.html

1) To initialize a new project on Transifex:

# tx init
# tx set --auto-local -r hexchat.main "po\<lang>.po" --source-lang en --source-file po\hexchat.pot --execute

Append 'type = PO' to .tx\config without apostrophes

Push the resources to Transifex
# tx push -s -t



2) To update online translations:

Regenerate the source file (hexchat.pot) on a Unix machine
# ./autogen.sh && ./configure --enable-nls && make

Push the updated source file to Transifex (this automatically updates all translation files)
# tx push --source



3) To update repo with online translations:

Update local copy with Transifex updates
# tx pull

Update GitHub repo
# git add po/
# git commit
# git push