add tooltip to cells if 'truncate' variable is set

If a Column has the 'truncate' variable defined, we should
have a tooltip to show the full text if user hovers over
a cell. For example, Project > Volumes Description column is
truncated at 40 chars. 'Truncate' column attribute should be
used on Strings, not Integers, fixed test case.

Change-Id: I960744f73b84e54d196e264039ebba9614db372b
Closes-Bug: #1369944
Imported Translations from Transifex

For more information about this automatic import see:
https://wiki.openstack.org/wiki/Translations/Infrastructure

Change-Id: Id51110321ab6102a3d4a5ecc3c6c70f3aa36f862
Merge "add tooltip to cells if 'truncate' variable is set"
Merge "Imported Translations from Transifex"
Merge branch 'master' of https://github.com/openstack/horizon