Sigla in holdings should include name of city

[jenniferward]

Can the city of the holding library be included in the Exemplar display? It it hard to tell at a glance what cities are meant. Example: https://muscat.rism.info/admin/sources/990066380 with I-PCd and I-PS Especially since both have Archivio capitolare in their institution name. I think this would be a convenience similar to https://github.com/rism-digital/muscat/issues/1577.