Allow to hide Y axis label

Allow to hide Y axis label and just show the lines.

Change-Id: Id79c9104104cf705e269aa97dc0748c0d976f46a
Closes-Bug: #1352269
Imported Translations from Transifex

Change-Id: I62eb79624d41dedb84ab3897a5776e9cc3efa378
Merge "Allow to hide Y axis label"
Merge "Imported Translations from Transifex"
Merge branch 'master' of https://github.com/openstack/horizon