by SunsetFollower511
Great question. Translate is actually an entire tree of skills on top of a spell; the closer to "human" speech an unknown language is, the easier to translate. There are some perks ("Learn by Osmosis") which allow some semi-temporary boosts to the effective level of the translate spell under specific circumstances (i.e. conversing with a person who knows the specific language already), but Nuru did not have a way to use those to pick up the aquatic skills, and it was too different from normal human speech for Sanaa's spell level to handle... yet.