Feed description length constraint

[maroskucera]

Currently, the feed creation form allows the Description field to be of any length. However, using a description longer than 255 characters, for instance the description from the original News feed, causes error 500 when saving. I'm personally in favor of changing the DB column to text type and setting the limit to a more generous length, instead of just limiting the form field to 255 characters, but there may be consequences that haven't crossed my mind 😅