In Savage Worlds Deluxe, the Jack-Of-All-Trades edge grants the following benefit:
Any time he makes an unskilled roll for a Smarts-based skill, he may do so at d4 instead of the usual d4–2.
Languages fit under the category "Knowledge (Smarts)", and so are Smarts-based skills. The chart for Languages says:
d4: The character can read, write, and speak common words and phrases
Does this mean Jack-Of-All-Trades edge provide the ability to read/write/speak common words and phrases in any language?