Test Log in as admin Turn on multi-lang filter for content and heading site administration > plugins > filters > manager filters Create a course with a multi-lang full name and short name E.g. full name <span lang="en" class="multilang">Course 1</span><span lang="fr" class="multilang">FR</span> short name <span lang="en" class="multilang">C1</span><span lang="fr" class="multilang">FR</span> View the course and click on “Calendar” in the nav drawer to go to the course calendar Create a new event for the course and set a multi-lang string for the event title and some HTML content for the description E.g. event title <span lang="en" class="multilang">Event title</span><span lang="fr" class="multilang">FR</span> Description click on the down arrow (top left) to show more option in the atto toolbar and turn on HTML mode (bottom right) and past something like <h4>Heading</h4> <p>This is some <strong>bold</strong> text.</p> CONFIRM that the event is created Click on the event to open the summary modal CONFIRM that the event title only shows the English string (assuming your site language is in English) CONFIRM that the course name only shows the English string CONFIRM that the description is rendered correctly with the heading and the bolded text.