Port front-end changes from fba96c808d to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

Port ac092d03e7 to glitch-soc

The rationale behind this is that if the user wants to report violent media,
they might not want to see it repeatedly. The “sensitive” property is still
kept, displaying different messages for hidden media depending on whether
they are marked as sensitive.

Ports 219aac7800 to glitch-soc