core/checkbox-toggleall-master-button does not allow its CSS class to be customised

Setup A course with at least one teacher and at least 2 students. Template library demo for customisation Go to Site administration / Development / Template library. Search for the checkbox-toggleall-master-button template. Confirm that the button is rendered as a large primary button . Regression tests Choice Create aa Choice activity in a course with the following settings: Has at least 2 options. Publish results: Always show results to students. Privacy of results: Publish full results, showing names and their choices. Show column for unanswered: yes. Log in as a teacher. Go to the choice activity. Below the Responses table, confirm that the " Select all " button is styled as " btn-secondary ". (You can inspect the button and check its " class " attribute) Database Create a database activity Define at least one field Save a default template Create at least 2 items View the items list Confirm that the "Select all" button is styled as " btn-secondary ". Inspect the checkbox on any of the entries. Confirm that it has the " recordcheckbox " class Feedback Create a feedback activity Open the list of non respondents. Inspect one of the checkboxes in the non-respondent list. Confirm that they have the " mr-1 " class. Course participation report On the course homepage, click the cog icon, then " More... " Go to " Reports / Course participation " Select the choice activity and press " Go " Confirm that the "Select all 'No'" button is styled as " btn-secondary ". Label classes Go to Site administration / Development / Template library Search for the template " checkbox-toggleall-master ". Confirm that the template renders. Confirm that its label is styled with the "badge badge-info" class. Search for the template " checkbox-toggleall-slave ". Confirm that the template renders. Confirm that its label is styled with the "badge badge-info" class.