Fix concatenation in Database actions

Remove concatenation and pluralization issues from Terminate
Instance, Restart Instance, Delete User, Delete Database,
and Delete Backup actions.

Change-Id: Ic8f343e7ad03497591e154d92e78d637618bf5e9
partial-bug: 1307476
Fix concatenation in identity related actions

Fix concatenation and pluralization issues from
Delete Groups, Remove Users, Add Users, Delete
Projects, and Delete Domains actions.

Change-Id: I7ba06a1acd720165af23a6fb475d061d2cab0e8a
partial-bug: 1307476
Imported Translations from Transifex

Change-Id: I9334df91a6ba01d2ed7c0211c6a54f8445b0ca0d
Merge "Fix concatenation in identity related actions"
Merge "Fix concatenation in Database actions"
Merge branch 'master' of https://github.com/openstack/horizon