Suggest tooltip ideas

New users don't know, for example, what things like Modules, Jitsi are and do. It would be useful to add them throughout the application, in order to make it more clear for them.

Ideas:

• What "shared edition" next to a course means (main page)
• Where the events in the calendar are taken from (calendar)
• What "edition" heading means (catalog)
• Explain that catalog is just for enrolling in NEW courses (catalog)
• Make it clear that requests page is only for requests you can TAKE as a TA, especially if it is empty it might be unclear (requests)
• What the difference between "assigned" and "handled" is (requests)
• Make it clear that "My requests" are requests I made, not requests that I took, and that there is no way currently to view the requests you took (my requests) (btw for me that page is weirdly formatted)
• Improve "create shared edition" tooltip (teacher main page)
• What "hide in Queue" button means (teacher edition page)
• What exporting does, e.g. what in format and why is it useful (teacher edition page)
• What "student groups" are (teacher module page)
• What a module and a session is (teacher module/session pages)
• What is wait vs processing time (teacher status page)
• What questions tab does (teacher question page)
• What "bucket duration" is (teacher session status page) (btw seems broken to me)
• What "present" means (teacher session page)
• What Jitsi is (creating/editing a session)
• What "extra info" is supposed to be used for and who sees is (creating/editing a session)
• What "cluster/mentor group restriction" and "module division restriction" are (creating/editing a session)
• What "enable bilingual requests" and "enable experimental features" do (creating/editing a session)
• What "grace period" is (creating/editing a session)