"yes"

Translation: ano

[Namedroppinwill]

When I was living in Czech a learned the sound "yo" meant yes?

[topkekyolo]

yeah, it is written "jo", but it is informal way of how to agree

[CultureSharked]

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

[LinGhost]

Should this be updated to include, "jo" and "no" as valid answers?

[endless_sleeper]

Should this be updated to include 'yep', 'yeah', 'aye', 'yass', 'yup', 'yesh', 'uh-huh' or any other expression of affirmation?

There's your answer.