util/translation.py tool for notebook po and pot files management
argparse subcommands implemented
LocalData for notebook specific info and stringdocs added
some PEP8 spacing
fuzzy warnings fixed
added support for named languages in settings
Corrections in string docs
lazy messages added
typo in docstring and pep8 stuff
extract nN_ dummy translations
Merge pull request #238 from migeruhito/po_management

Po and pot management utility
dummy translation functions N_ and nN_ and js localization refactor
nN_ made accesible to localization.js