Revert #2101

Revert "change preference summary text"

This reverts commit 79359fc6.

Revert "Add SPDX header"

This reverts commit 9b19ae55.

Revert "Store preference for richtext-editing"

This reverts commit 6291cdc0.

Revert "Allow an edit fab to replace the rich text fab"

This reverts commit c15c5293.

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>