divination 

Traditions arcane, divine, occult

Cast [>>] somatic, verbal

Range 30 feet; Targets 1 creature

Duration 1 hour

The target can understand the meaning of a single language it is hearing or reading when you cast the spell. This doesn't let it understand codes, language couched in metaphor, and the like (subject to GM discretion). If the target can hear multiple languages and knows that, it can choose which language to understand; otherwise, choose one of the languages randomly.

Heightened (3rd) The target can also speak the language.

Heightened (4th) You can target up to 10 creatures, and targets can also speak the language.

Core Rulebook, page 325.