Show canonical affiliations as hover text in affiliation facet

[ehenneken]

If you do an author search author:"Henneken, E", you get the affiliation facet with top level entries

SI
Harvard U
U Wa
JHU

which in general are pretty cryptic. It would be helpful to have the canonical affiliation appear when you hover over each top level entry. This probably true for child entries as well.

[aaccomazzi]

While this option is useful, it should be considered in the broader context of allowing facet labels to have additional hover text, which is not trivial since this data is not part of the facet information retrieved from SOLR.

We should discuss available options with @romanchyla in the context of enhancing the current experience