🔖 concrexit v26

Errors resolved

• Fix thumbnailer collision (!1344) security
• Don't generate invalid membership dates (!1343)
• Always quote nicknames. (!1342) security
• Correct translations of 'wire payment' (!1339)
• Photos show rotated (!1337) photos
• Push notifications don't show content only title twice (!1336) events push notifications
• Adjust CSS for accordion elements (!1331) style
• Block benefactors or non-members in the next lecture year from giving references (!1330) registrations feature
• Fix society filter in member achievements (!1326) activemembers
• Clarify costs warning (!1324) events
• Fix pizza order permissions (!1321) pizzas
• Closes #887, photo url notification is no longer relative (!1311) photos push notifications

New functionality

• Add explicit end date for members to board pages (!1325) activemembers
• Wire transfer payments for events (!1323) events
• Improve event categories (!1320) events

Technical changes

• Remove obsolete Topicus logo HTML from newsletter (!1322) newsletter
• Remove shorthand and period from education Course model (!1319) education
• Remove unused features from partners package (!1318) partners
• Remove redis dependency (!1317)
• Add tests for close announcement (!1313) testing
• Remove mark all present feature from events (!1284)