Tooltips for loads of things

Change-Id: I993bf60909024453a14de85af6239bded02eb8a6
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/546
(cherry picked from commit ea610f8256f96e5e7909991049298dc9866a15e3)
Merge "Tooltips for loads of things" into wmf/1.24wmf9