Disable Grammarly on compose area (#911)
Generally 3rd party extensions are in the responsibility of the user and
we should not embed vendor-specific attributes into our markup, but
Grammarly has repeatedly been causing problems with Threema Web,
resulting in incomplete/garbled text being sent to contacts.
Furthermore, let's not forget that Grammarly sends your personal Threema
conversations to the cloud for processing, it's thus not much different
from a keylogger. The terms of service even grant Grammarly a full,
perpetual, transferrable and irrevocable license to all your user
content. This clearly contradicts our values regarding user privacy.