Add gettext strings

Signed-off-by: Daniel Francis <francis@sugarlabs.org>
Setup gettext

Signed-off-by: Daniel Francis <francis@sugarlabs.org>
Setup i18n

* Finish with Python gettext configuration
* Add a script to generate pot files and merge with po files.
* Build mo files with setup.py
* Generate translated man files

Signed-off-by: Daniel Francis <francis@sugarlabs.org>