Firefox localization packs

[Andrew Pantyukhin]

Dear maintainers of firefox localization packs!

www/firefox-i18n has just been committed to the ports tree. The
port can install any number of official firefox locales. Can you
please test it and consider if the port has all the functionality
your ports provide. In case it does, please ask me to remove
your ports. In case it doesn't, please let me know and we'll
discuss what needs to be added/changed.

Thanks!