search: user-preffered output format

Signed-off-by: Eirini Psallida <eirini.psallida@cern.ch>
Please check if this work better:
```jinja2
{{ _("You have made %(x_num_queries)d queries. A detailed list is available with a possibility to "
     "with a possibility to view search results and (b) subscribe to an automatic "
     "email alerting service these queries.", x_num_queries=queries) }}
```
Thanks!