This would be rather Earth-centric, but Latin is also a root language for many Earth languages. This could be key to being able to understand linguistics. I suppose that once the skills are learned, there could be a connection that could help with decifering alien languages or something.
Many? Does this include Hindi and Mandarin?
In terms of overall speakers, maybe. But there are probably as many English speakers as there are French, Spanish and Italian combined (English has a lot of Latin-descended words, but it's root is not Latin).
Just seems that Earth history/culture should not take precedence in a multi-species Federation. No more than California take precedence in the US, when it's just a state like the 49 other ones.