Great news everyone!
We have re-created the wiki page, “Create a new localization” on the MDN wiki! This introduction to mozilla L10n that you all know and love has been simplified, updated, and clarified. Appropriately addressing multiple audiences, this guide serves as both a technical tutorial and quick reference guide for newcomers of all backgrounds.
The guide is currently in draft and could use some thorough review to ensure that everything has been updated correctly. Thus, I make a sincere petition to all: please take a minute to read it and let me know what you think! You can either comment below or file a bug using this template.
Here is the new L10n guide. Be sure to add it to your bookmarks! Thank you all for your feedback.