Load data for all categories

I will define layouts before enabling remaining options.
Replace data for institution type filter with data for institution filter
Add select lists for filters, load categories data for filters

In the next step, I will fill each list from the corresponding
list of categories, including the total number of author in
each category.
Fill the lists of categories used as filters

The first option, whether present initially or added dynamically,
is the option selected by default.

After filling the list and whenever the value of the list changes,
the event "filter-selected" is published with an object giving the
name and value of the select list.