Fix translate static messages in response

Messages created statically (during import) were not being
translated in responses when the Accept-Language header was
used to set the expected language in the response. The static
messages were being created before the _ built-in had been
installed by gettextutils.install().

Change-Id: Ie56b1d3a836bc5f2262d7af68f803a08ebdf016f
Resolves-Bug: #1215192
Merge "Fix translate static messages in response"