Adjust names of templates

[jenniferward]

Along with #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?