Display "Not available" in hidden sections which name is displayed to users

Test on one device of your choice: Note, to test that, MDL-64657   should be in closed status. Using the Master test site, enter the course: "Course with hiddens and restrictions". If you are not enrolled, the self enrolment is enabled. Show all sections and check section match description: Section hidden from students: you should see a "Not avalaible" badge. Section restricted...: you should see the avalaibility info badge. Also there's a 3rd section called: "Section restricted, shold not be shown" but you should not see it. Now open the section selector and check you see the same. Click on the Section hidden from students Check you see the "Not avalaible" badge bellow the section selector. This issue needs a lot of testing so all the test indicated in MDL-64657 must be performed as well (but using the app instead curl requests) to check that the information displayed in the app matches the one displayed in the site