How can I change the default text in my search bar. On desktop view it is currently correct but on mobile view the name of the site is wrong ("&" is coming up in between my wiki title)
Topic on Project:Support desk
you might want to file a bug at https://phabricator.wikimedia.org about this double escaping issue.
You can usually append ?uselang=qqx (or &uselang=qqx) to find which page in the mediawiki namespace controls which part of the interface.