webadmin: In some locales alerts and Events Icons overlapping on text

On the bottom Alerts/Events pane the "last message" text is overlapped
by the icon.
The message width changed to 100% to solve it.

Change-Id: I403d87ad02f604e8ceb5c5a5e075c03e4fe7cf22
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>