After log in into webui there was 'Authenticating' sign even during loading metadata.
Now while data are loading there is 'Loading data' text. This change requires new global
topic 'set-activity' of activity widget. So for now there is possibility to change
every activity string during running phase just by publishing 'set-activity' topic
and setting new text as first parameter.
Part of: https://fedorahosted.org/freeipa/ticket/6144
Reviewed-By: Petr Vobornik <pvoborni@redhat.com>