Make "Country" and "Source" columns sortable on Source List page #1592
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Closes #1217 by making the source list page sortable by the "country" and "source" (city + institution + siglum) columns.
Additionally, this PR adds the
sortable_header
template tag. This tag renders a column header for a sortable column, reducing the need to repeat this construction multiple times in thesource_list
and other templates. This template tag can be reused in any template where we sort by column headers (I'm thinking here especially of the Chant Search table; I've made #1593 for this).Finally, makes some minor code cleanliness changes to the SourceList view: annotates function return type and makes use of the assignment operator to reduce the number of statements in the
get_queryset
view.