Phabricator qqq pages are non-intuitive (IMHO)
Having those autolinked to the source code is work-in-progress. I believe there isn't proper human written message documentation unless someone writes it.
Problem is that we can't be expected to provide good translations with bad documentation. I know it is not an issue of you nor from translatewiki.net itself; just feedback that this should be fixed where appropriate.
I'm sympathetic, but Phabricator developers have shown very little interest for a good i18n and what it entails (Nike was even forced to design an entirely new process to suit their non-standard methods and formats), so the alternative would be no i18n at all.
Our hope is that with this collaboration they will learn to appreciate i18n and adopt better practices. If it doesn't happen, at some point we'll need to reconsider...