Language::commaList() gets called even though in 99% of cases it's not
description that's needed but other parameter information, resulting in
0.6% of overall cluster CPU time being wasted per
https://performance.wikimedia.org/xenon/svgs/daily/2015-01-02.svgz
Change-Id: Ic77e4a03d1bbd1aa5f86dc250d9f903d7eb25618
