Locale switcher doesn't work on the Online Demo website

Problem/Motivation

When deploying the module using commercetools_online_demo https://simplytest.me/project/commercetools_online_demo - the locale switcher doesn't work, seems a caching issue.

Also, custom styles for the Categories block in the content module doesn't apply for some reason, need to fix this too.

And, together with this, also set the commercetools logo as the site favicon.