userportal,webadmin: i18n remove user role dialog

- Fixed user role removal dialog not being i18ned.
- Fixed system role removal dialog not being i18ned.

Change-Id: Ida914d031978326ce6743dd8e83bfa6276a9a964
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1000224
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1001410
Signed-off-by: Alexander Wels <awels@redhat.com>