Fix watchdog configuration for localized webadmin

Watchdog settings for type and action were directly translating
the possible values. That caused issues during saving as the
selected enum value could not be detected due to localization.

This updates the code to use the proper way of rendering localized
enums.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1135467
Change-Id: Id1ff4c839c112d4a8956cc40f5ee30294c67cc08
Signed-off-by: Martin Sivak <msivak@redhat.com>