Bugfixes

• Calendar invitation message is wrong #3682
• Headers are not formatted correctly anymore #3625
• Gift card display after purchase does not show a qr code #3516

Milestone

https://github.com/tutao/tutanota/milestone/187?closed=1

APK Checksum

SHA256: c71289e545b058b586b2603841c64fa3db7effa18392e413dce92627f07efadb