Change header for Bower DB on institution page

[dchiller]

We'll change the name here to accord with how it's referenced in other parts of the site... "Clavis Sequentiarum (Sequence Database by Calvin Bower)"

[ahankinson]

I did this to match the actual name in the "Segment" table:

https://cantusdatabase.org/admin/main_app/segment/

It would be handy to change it there too, and then use that as the authoritative name.

[dchiller]

Putting this on hold for now. Debra sent out an email for what to name this segment last week, so we'll wait until there's consensus there.