I was testing my Discourse site as new user.
When I’d tried to create a post with less than 20 char its gave me the following alert:
I think this (
) Heart icon meant to be this (
) Smiley face.
I know its not a big issue but it could be confusing for new users!
Nope, it is meant to be the , as it is trying to encourage the user to use the (to like a post) instead of saying things like “I agree”, or “Yes”, or “I like”
Sorry for that!
But may be adding “instead” before the question mark could be more understandable. Since the user already in writing situation 
Won’t fit in two lines, which is the goal.
Posts must be at least 20 characters
Would a make your point?
Posts must be at least 20 characters
Could a do the job?
Posts must be at least 20 characters
That short, a could do.
Posts must be at least 20 characters
Brief thought? A instead!
Posts must be at least 20 characters
Short thought: use instead?
Posts must be at least 20 characters
Instead, consider a .