Adding display size limits to username on channel and posts

Benrequested to merge
fix/feed-name-overflow-4146 into master

Closes #4146 (closed)

Thoughts on doing it this way?

I also noticed you can take up a huge amount of space by having a really long name so i dropped a 3 line limit on it. If there's another angle to come at this from let me know.

Edited by Ben

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