LIBDRUM-99. Change ETD embargo message

commit 0bb36b24da2b20d48aa2c7921e5c8252f0125f33 was a mistake,
should have been included with this commit

https://issues.umd.edu/browse/LIBDRUM-99
LIBDRUM-98. Addition to Advanced Search Dropdown

https://issues.umd.edu/browse/LIBDRUM-98