When I was living in Czech a learned the sound "yo" meant yes?
yeah, it is written "jo", but it is informal way of how to agree
Agree, and to further describe, it's often heard in response to an answer or statement during a conversation that is in a rush or enthusiastic
Should this be updated to include, "jo" and "no" as valid answers?
Should this be updated to include 'yep', 'yeah', 'aye', 'yass', 'yup', 'yesh', 'uh-huh' or any other expression of affirmation?
There's your answer.