webadmin: Change type field name in data center dialog to storage type

Change-Id: Ia28a61d6e8daa72efdeaa15021bb5152df766aed
Bug-Url: https://bugzilla.redhat.com/1143958
Signed-off-by: Tal Nisan <tnisan@redhat.com>
webadmin: Change text in storage tab and subtabs to fit standards

Change-Id: If38af6989b524ef53ebe1e3ab7b9c299020a4fa7
Bug-Url: https://bugzilla.redhat.com/1149471
Signed-off-by: Tal Nisan <tnisan@redhat.com>