Rename locale files.

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>
Cleaned up translations. Moved to Spree.t style translation.

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>

Conflicts:
	config/locales/fr.yml
Merge pull request #34 from FineLineAutomation/master

Cleaned up locale files and translations on master