R1:8c360ab703de

Rename "Apply build plans" to "Run build plans" in Herald

Summary: "Run" is clearer than "Apply". This has already been changed in Harbormaster itself.

Test Plan: used eyeballs

Reviewers: btrahan, zeeg

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7889