v5.0.4 Beta 2

#2251: Added a default max-width to portrait videos
#4116: Fix issue where assignment was not removed when commenting
#4117: Fix issues where default calendar views showed an error
#4118: Remove duplicate hook points
#4120: Extract onlineUsersRow into a separate template so that hook point is usable
#4122: Remove last_post_data upgrade step
#4124: Fix issue where club calendars were loading the overview with incorrect links
#4098: Fix issue where en-dash character broke SEO titles (also patched in Beta 1)
#4094: Fix issue where Open Assignments menu did not show team assignments (also patched in Beta 1)