Rebuilding gives db:migrate error due to broken plugin

Product Support Self-hosting
4

https://github.com/liip/discourse-multilingual-support is a broken plugin.

I, [2022-03-07T10:24:30.440910 #1]  INFO -- : > cd /var/www/discourse && su discourse -c 'bundle exec rake db:migrate'
rake aborted!
LoadError: cannot load such file -- single_sign_on
...
/var/www/discourse/plugins/discourse-multilingual-support/plugin.rb:18:in `block (2 levels) in activate!'
...