Display finalized future exams

Closes #8

See merge request !14

Sort student submissions by grading and date

Closes #16

See merge request !15

Resolve "Support public and private frontend routes"

Closes #29

See merge request !16

J. Tóth Tamás authored Dec 07, 2021 and Máté Cserép committed Dec 07, 2021

Add a user settings page, and remove the now-redundant language dropdown
in the logged-in view (but keep the dropdown when logged out). Also
change the mock login form to specify that it asks for the "official"
email address, not the custom one.

User settings page

Closes #9

See merge request !13