Replace #p-lang-list with #p-lang .body ul

The #p-lang-list id was removed from core (I028880cfa),
and this broke the compact links beta feature.
This commit replaces it with a different selector.

Change-Id: I154919a54b032dd481fe080204a2a16819d85140
(cherry picked from commit 50f6bdce298587b9cc9735d43fed0b759b814bfd)