🔖 Thalia Website v1.17

Errors resolved

• Fix translation of 'successful' (!909 (merged)) registrations i18n
• Fix 'registration' verbose name (!918 (merged)) registrations i18n
• Fix email subject of renewal rejection mail (!911 (merged)) registrations i18n
• Use correct english names of studies (and translate "Access the Sentry backend") (!892 (merged)) i18n
• Fix some small bugs in translations (!861 (merged)) i18n
• Make sure docblocks match specs (!901 (merged)) documentation
• Change payment processing to use POST requests (!916 (merged)) security registrations
• Change registrations processing to using POST (!915 (merged)) registrations security
• Resolve "Fix names of categories of pushnotifications" (!860 (merged)) push notifications
• Fix sorting of registration dates in event admin (!854 (merged)) events
• Allow accessing documents from admin pages (!841 (merged)) documents

New functionality

• Add direct link to payment from registrations model admins (!917 (merged)) registrations payments
• Add LectureYear filter to EventAdmin (!853 (merged)) events
• Resolve "Automatic generation of board email addresses" (!844 (merged)) mailinglists
• Scheduled notifications for events (!831 (merged), !847 (merged), !846 (merged)) push notifications

Technical changes

• Change lunch break times in registrations emails (!914 (merged)) registrations
• Switch to Python 3.6 as runtime python (!908 (merged)) server
• Uncapitalize two translations for registrations (!904 (merged)) i18n registrations
• Replace 'sponsor' with 'partner' (!903 (merged)) push notifications members partners registrations
• Add documentation to membership emails (!900 (merged)) documentation members
• Only sphinx in production entrypoint (!894 (merged)) server
• Remove django-slack dependency (!889 (merged)) ~code
• Use pipenv instead of requirements.txt (!879 (merged), !910 (merged), !905 (merged), !876 (merged)) ~"code"
• No linenos in po (!859 (merged)) ~"code"
• Get CELERY_BROKER_URL from env vars as a whole (!852 (merged)) server
• Validate docker-compose.yml (!851 (merged)) ~"code"
• Docker compose update (!850 (merged)) ~"code"
• Check validity of email addresses in members emails (!913 (merged)) members
• Rename the notification category for partners (!912 (merged)) push notifications
• Update privacy policy (!897 (merged)) board

Things to do after release: update https://gitlab.science.ru.nl/thalia/concrexit/wikis/instructions/Board-change procedure.