Moved setup, translation config files into subdir

compile-messages.sh

etc/babel.cfg/about

etc/babel.cfg/blog

etc/babel.cfg/comparison

etc/babel.cfg/docs

etc/babel.cfg/get-involved

etc/babel.cfg/misc

etc/babel.cfg/priority

etc/babel.cfg/research

etc/multi-domain.patch

etc/project.vars

etc/reqs.txt

etc/translation.vars

extract-messages.sh

init-new-po.sh

setup_venv.sh

update-existing-po.sh