Make the alert type in horizon.alert translatable

Instead of just capitalizing the class name, I do a lookup in a
dictionary of human-readable (and translatable) names for the
different alert types. This also lets me use "Notice" in place of
"info", which sounds better at least to my ears.

Change-Id: I985c25a7228aee9cf1cbce222cec4bca0db05d35
Closes-bug: #1224347
Remove 'file' source type when HORIZON_IMAGES_ALLOW_UPLOAD is False

settings.HORIZON_IMAGES_ALLOW_UPLOAD is meant to hide everything
related to direct file uploads in the CreateImage dialog, but at
the moment it's just removing the image_file field and leaving
"File" as an option in the Source type dropdown.

This change removes the 'file' source type when necessary, and
hides the source type field altogether if there is only one source.

Change-Id: Idefb225bccb26fc4cf04f78387e205cb2fbacfd9
Closes-bug: 1251101
Updated from global requirements

Change-Id: I591ac9871db60fc4191ae0997bbc790e8f37104c
added Neutron incompatiility note for simple IP management

fixes bug 1196541

Change-Id: Ib3a5c7cc63e07f4cf813279546ec74a389b63227
Fix translatable string for "Injected File Path Bytes"

Change-Id: I7a60c371621bd37d1918db7ddcabd4cb2dcd9d0d
Closes-Bug: #1254049
translate text: "subnet"/"subnet details"

When trying to create or update a subnet from the Networks
details page, the tab titles 'Subnet' and 'Subnet details'
are not showing as translated. This patch add the missing
underscore.

Change-Id: I48cd47e7ead3717d96e4808f41bf876a567c8052
Closes-Bug: #1254026
Merge "Remove 'file' source type when HORIZON_IMAGES_ALLOW_UPLOAD is False"
Merge "added Neutron incompatiility note for simple IP management"
Merge "Make the alert type in horizon.alert translatable"
Merge "Updated from global requirements"
Merge "translate text: "subnet"/"subnet details""