🔖 concrexit v26

Errors resolved

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

New functionality

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

Technical changes

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