Create a Language Pack

How do I create a language pack? I want to take the British language pack and make an American version.

Do I just copy the British and start editing? What file(s), where? How do I upload it for others?

Thanks

There must be a solution to this in these forums, I just can't find it. What if I wanted to create an entirely new language pack? Where do I start? How do I package it up and upload it for others?

Based on our experience last year of doing a Gaelic localization, you basically grab the installation, look for the English language php files and translate everything after the =

You will also have to change the english.php to your locale's name and amend any locale data needed. I *think* that's more or less it but I'm not 100% certain either.