What kind of check is needed to read something to a character that doesn’t speak the language?

So, I have a party with a Half-Orc Barbarian who cannot read. The last session ended with the party discovering a note written in Orc, which nobody other than the barbarian speaks. Multiple members of the party speak and read Dwarvish.

Since Orc and Dwarvish use the same script, the plan is to read the note aloud to the Half-Orc and have him translate what he hears into common. Similar to if an English only speaker tried to read Spanish to a Spanish speaker for them to translate. I like the idea, but I don’t know how best to resolve the result.

What would be the appropriate skill checks for the reader and the barbarian? How much should the result of the reader’s roll affect the barbarian’s DC to understand/translate?