Goblinese
Goblinese is the language spoken by goblins. The language is useful to be able to talk to Goblin NPCs, some of which train abilities and even teach new skills!
How To Learn
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To learn Goblinese you have to translate (by right clicking) one of the goblin business card that has a level requirement of zero. These cards are common drops from goblins in the Goblin Dungeon. Note that the name of the level 0 card is not always the same, so what you are looking for is the absence of the red text.
The first and second levels in Goblinese are obtained by translating a single card, so it is recommended that you hold onto the Level 1 and Level 2 cards if you find them.
Translating the goblin's business cards reveals often amusing business slogans (the text appears only briefly in the center of the screen so it is easy to miss).