Elmo is l.m.o, which is l10n.mozilla.org.
Elmo is an infrastructure of web apps that are intended to help the l10n community. Presently, our tools, docs, sites, wikipages, etc., all live in a fairly disorganized, disparate world that we often ask localizers to navigate to get stuff done.
This documentation is about the elmo django application and how it works and why it works like it works.
All code is available here: https://github.com/mozilla/elmo
The production is available here: https://l10n-stage-sj.mozilla.org/