Languages

Most characters seem to speak a common language. Given that only Qum and children seem to speak it improperly, it is apparently well-known by most groups and nations. However, other languages do exist. Untranslated elven and dwarven words are marked in the text with a different color, and the same colors are used to mark conversations entirely in other languages even when the displayed text is in English.

Elven
Text in the Elven language is marked in. You first encounter it when the party comes across a pair of elves in Delgar Forrest. Aka knows a bit due to her bounty hunter experience, and when you are able to spend longer time in the elven kingdoms she uses the occasion to practice her skills.

Known words and expressions:
 * : used for greetings and farewells; it means something like "it is peaceful" (the meaning is discussed by Simon and Aka).
 * : the elven name for the elven language.
 * : exclamation uttered by one of the elves after spotting Altina among humans, in human gear. It might be a generic expression of (unpleasant?) surprise, but the elf calls her an "apostate" in the very next sentence, so the meaning of the expression might be related to the accusation.
 * : A formal word for "scholar", used as a title.

It's unclear whether the names of the elf kingdoms Darghelon and Gheldaron and the elf-queened Ghenalon have any significance other than the common suffix.

Dwarven
Text in the Dwarven language is marked in. You first encounter it in Eustrin. It sounds suspiciously Germanic.

Known words and expressions:
 * : "Yes", the same as in German.
 * : "Dwarves"; the singular is unclear.
 * : a greeting.

The names of dwarf countries also seem to share a common suffix: Eustrin and Suorin.

Other
In the Dark Ruin you can find a text that Yarra says is written in "an ancient succubus language." She's able to read some of it.