Provide gettext _ in missing locations

A while back a change was merged that moved
our shortcut for gettext out of __init__
(change here: If4125d6bcbde63df95de129ac5c83b4a6d6f130a)

This worked out fine for the most part but broke the sphinx doc
builder for a number of files.  This patch just adds the proper
import to each of these files to get the builder working correctly
again.

Change-Id: Ifed20d309566be456c9519294714ccb45de76e00
Closes-Bug: #1209406
Merge "Provide gettext _ in missing locations"