Add "zoom" but really just view-file

The zoom icon should get replaced Real Soon Now - looking at you, pginer

Change-Id: I88c1d4fb95e034e0f2fe618eb7309754ea1c283e
(cherry picked from commit b2039ad7eb8a994d78ab45761d8dae405e729ac9)
Use original URL when setting download for original

Messed with the download tests a bit too.

Change-Id: I6b7f6b5eb8642db1a81aff05663636813a21fe06
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/470
(cherry picked from commit fc02ce0dc89b00f81a03b3e786ac2af60fa318a7)
Merge "Use original URL when setting download for original" into wmf/1.24wmf8