As an user of the application I would like the messages being passed around the application to always be of type string and not have instances of the mw.messages object being passed around
- Refactor the MediaSearch Frontend code to just use text messages
CONTEXT: this ticket was created as a consequence of a comment raised by Timo Tijhof on the path https://gerrit.wikimedia.org/r/c/mediawiki/extensions/MediaSearch/+/726147