fix #3058: ui: improve remote edit UX by clarifying ID vs host

also fixup missing emptyText for fingerprint (adapted from PVE's PBS
storage addition) and code-style in surrounding areas a bit

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

www/form/RemoteSelector.js

@@ -16,7 +16,7 @@ Ext.define('PBS.form.RemoteSelector', {
     listConfig: {
 	columns: [
 	    {
-		header: gettext('Remote'),
+		header: gettext('Remote ID'),
 		sortable: true,
 		dataIndex: 'name',
 		renderer: Ext.String.htmlEncode,