Calendar Proxy – makes your HISinOne timetable not suck.
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That doesn't look like a valid my.h-da.de calendar link.
Result
How to use
Go to my.h-da.de → Stundenplan → iCal Export
Copy the calendar link and paste it above
Click Build new URL to get your proxy link
Subscribe to the proxy URL in your calendar app: Google Calendar: Other calendars → From URL Apple Calendar: File → New Calendar Subscription Outlook: Add calendar → From Internet
Your events will now have clean, readable titles 🎉