Well, Data, not being an Earthling, would have every reason to refer to all Earth languages as "obscure" by default - save for English, which by some cosmic accident has attained some sort of interstellar relevance.
Whether Picard speaks French (and, say, Bashir speaks Farsi or Sisko speaks some sort of Cajun that not even his own son could decipher without the UT) is not dependent on the status of the French language as such...
The USA was not affected by WWII, either. Not if you arrived in California half a year after the war concluded (like Janeway apparently did), and not on any of those sixteen or so well-separated days when the newsstands still had headlines at least tangentially relevant to the already concluded war.
The history of Earth in Trek is different, and Trek isn't always shy to demonstrate this ("Past Tense", say). It's not a conceit or a contradiction if Earth gets shown without altering the street signs much or adding too many CGI craters, though: regardless of the quirks of history, most days just end up being mundane. Even in the 1940s or the 1990s.
Timo Saloniemi
Whether Picard speaks French (and, say, Bashir speaks Farsi or Sisko speaks some sort of Cajun that not even his own son could decipher without the UT) is not dependent on the status of the French language as such...
The USA was not affected by the Eugenics Wars.
The USA was not affected by WWII, either. Not if you arrived in California half a year after the war concluded (like Janeway apparently did), and not on any of those sixteen or so well-separated days when the newsstands still had headlines at least tangentially relevant to the already concluded war.
The history of Earth in Trek is different, and Trek isn't always shy to demonstrate this ("Past Tense", say). It's not a conceit or a contradiction if Earth gets shown without altering the street signs much or adding too many CGI craters, though: regardless of the quirks of history, most days just end up being mundane. Even in the 1940s or the 1990s.
Timo Saloniemi