webadmin: Fix alignment issues in Cluster Detail popup

Fixes alignment issues in Cluster Detail popup caused by the length of
text in French translation.

Change-Id: I34048f9485bffe2066e527e710bf9f3eff687e07
Bug-Url: https://bugzilla.redhat.com/1150599
Signed-off-by: Martin Perina <mperina@redhat.com>