template localize support and zh_TW translations.

add 2 new directories.
- po - gettext po files
- locales- generated messages.json that i18n-abide really loads. 

add 4 new npm commands.
- npm run gen-pot:  to extract gettext messages to pot file.
- npm run merge-po: to merge new gettext messages to existed po files.
- npm run update-po: gen-pot and merge-po at the same time.
- npm run gen-po-json: compile messages json which are really used.