Keybinds for MassExtract can be found in the AddOns category
Prospecting macro: #showtooltip Prospecting /click MassExtractProspecting or #showtooltip Prospecting /run MassExtract:Setup("prospecting") /click MassExtract
Milling macro: #showtooltip Prospecting /click MassExtractMilling or #showtooltip Milling /run MassExtract:Setup("milling") /click MassExtract
Lockpicking macro: #showtooltip Prospecting /click MassExtractPickLock or #showtooltip Pick Lock /run MassExtract:Setup("pick lock") /click MassExtract
To localize you could do the following for prospecting: #showtooltip Prospecting /run MassExtract:Setup(GetSpellInfo(31252)) /click MassExtract