Thanks! They were not there, but I was able to accomplish this by putting a file in plugins/theme/i18n/en/messages.xml and was able to overwrite feeds.
Example messages.xml for those looking to do this or something similar as well.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xliff PUBLIC "-//XLIFF//DTD XLIFF//EN" "
http://www.oasis-open.org/committees/xliff/documents/xliff.dtd">
<xliff version="1.0">
<file source-language="en" target-language="en" datatype="plaintext" original="messages" date="2022-08-05T16:59:44Z" product-name="messages">
<header/>
<body>
<trans-unit id="1">
<source>Log in with CAS</source>
<target>Log in with K-State SSO</target>
</trans-unit>
<trans-unit id="2">
<source>Search hierarchy</source>
<target>Search collection</target>
</trans-unit>
</body>
</file>
</xliff>