Adjust names of templates

[jenniferward]

Along with https://github.com/rism-digital/muscat/issues/1558, we'd like to adjust the names of the templates so that they are grouped together better and so that the information given in the titles is consistent. This affects the drop-down list in Sources

as well as the names of the templates that appear when creating a new record:

We suggest the following: Manuscript collection: Notated music, libretto/song text, treatise Manuscript item in a collection or single item: Notated music Manuscript item in a collection or single item: Libretto/song text Manuscript item in a collection or single item: Treatise Printed collection or single item: Notated music Printed item in a collection: Notated music Printed collection or single item: Libretto/Song text Printed item in a collection: Libretto/song text Printed collection or single item: Treatise Printed item in a collection: Treatise Composite volume

I'm not sure if space is an issue, but can we try this out?