New pytz, Babel, and nl_NL translations

- Updated pytz to 2013.8 (and moved it to libx)
- Updated babel to 1.3
- Updated flags to smaller files from https://github.com/lipis/flag-icon-css :-)
- Added nl_NL (Dutch) as a new translation, including flag
- Encoded more strings for translation support (and fixed some issues with formatting)