UX Bug: fix confusing responses to incoming subscriber messages

Behavior

• when responses disabled and i am a subscriber:
  • the error message assumes i was trying send a command, and tells me it didn't understand my command
  • but maybe i think responses are enabled...
  • this message should include context about how nothing happened to my message because i'm not an admin (and let me know that admins could enable responses if i ask them to)
• when responses disabled and i am a random person:
  • sending non-command text (ie: misspelled command "HOLAA"), responds with "i didn't understand that" but it should prompt me to join
• when responses enabled, subscriber sending response gets oddly formatted message
  • too many line breaks and indents on second sentence