Missing string setsubsectiontypeimage

[ewallah]

Detected when running behat tests.

Invalid get_string() identifier: 'visualsections:setsubsectiontypeimage' or component 'format_visualsections'.
Perhaps you are missing $string['visualsections:setsubsectiontypeimage'] = ''; in course/format/visualsections/lang/en/format_visualsections.php