Add general select for active school term

• The feature should be displayed globally.
• The information is stored in the session and provided via a GraphQL query.
• If a school term other than the current is selected, a highly visible notice has to be shown (idea: colored area directly under the nav bar including an icon and "back to current school term" button)
• The position of the select still needs to be defined.

mentioned in merge request AlekSIS/onboarding/AlekSIS-App-Cursus!2

What is wrong with the existing SchoolTermField?

Nothing. This issue lacks of some description. The purpose of this issue is to introduce a permanently available select for school terms somewhere in the frontend (e. g. in the navbar), which should be applied to all views and data (group list, timetable planning, class register, timetable frontend, ...)

I think we should discuss this in a devmeeting, where we would want to place this

changed title from Add general select field for school terms to Add general select for active school term

added part::backend part::frontend type::feature labels

changed the description

added 1 deleted label

mentioned in merge request !1466 (merged)

changed milestone to /AlekSIS%"[NLnet #7 (closed)] Global school term select for easily switching school terms and implement sub school terms"

created branch 911-add-general-select-for-active-school-term to address this issue

mentioned in merge request !1606 (merged)

mentioned in issue AlekSIS/onboarding/AlekSIS-App-Maka#14 (closed)

closed with merge request !1606 (merged)

mentioned in commit e9bd91da