Adicionado config que permite troca dinamica de temas.

dspace/config/dspace.cfg

@@ -1719,6 +1719,7 @@ xmlui.supported.locales = pt_BR, en
 # and debugging it should be turned off for any production repository. The default
 # value unless otherwise specified is "false"
 #xmlui.theme.allowoverrides = false
+xmlui.theme.allowoverrides = true
 
 # Enabling this property will concatenate CSS, JS and JSON files where possible.
 # CSS files can be concatenated if multiple CSS files with the same media attribute