Sanitise fields of MarkupText

[Michael-1]

I am using MarkupText to be able to use translation labels with HTML markup. At the same time, I would like that the fields that are interpolated into the translation to be sanitised (e.g. <span> to be rendered as <span>). The background is that field contents are dynamic, and often come from user input, an API or URL parameters, so they are susceptible to cross-site scripting.