From the log: could not find Node.js executable; ensure `node` or `nodejs` is in PATH or set NODEJS in environment to point to an executable. Rob told me that FF have disabled it for now, so let's try the same which will buy us some time until the disable options is removed in mozilla54.

Oops, add 10, make that mozilla64. Landing patch now, we'll see whether it works tomorrow, if now, we can back it out. That's quicker than getting a Daily/Nightly run going on try. And a one-liner doesn't break the bank ;-)

Pushed by mozilla@jorgk.com: https://hg.mozilla.org/comm-central/rev/6307e1b793f2 disable nodejs for l10n jobs. rs=bustage-fix

That worked for now, see: https://treeherder.mozilla.org/#/jobs?repo=comm-central&revision=222b53600d4c92120d300c7d6b5c6c4bc2809b0c