Major improvements of most extensions (except learning groups and timer)

extensions/appointments.py

extensions/components/module_information/scraper.py

extensions/components/poll/poll.py

extensions/links.py

extensions/mod_mail.py

extensions/module_information.py

extensions/news.py

extensions/polls.py

extensions/text_commands.py

extensions/voice.py

extensions/welcome.py

fernuni_bot.py

json_import.py

modals/link_modal.py

models.py

module_scraper.py

requirements.txt

views/appointment_view.py

views/mod_mail_view.py

views/poll_view.py