Interesting things about languages

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Across
  1. 2. the first language spoken in OUTER SPACE
  2. 6. one of the most difficult letters to pronounce in the world
  3. 7. the oldest spoken Indo-European language
  4. 8. the language in which NOTHING starts with N and ends in G
  5. 10. a book from the 15th century written in a language no one can identify
Down
  1. 1. the language in which a semicolon (;) plays the role of a question mark (?)
  2. 3. the language in which “gift” means both married and poison
  3. 4. the first language to be printed
  4. 5. the official language of England for over 300 years
  5. 9. the language in which New York is written as Njujork, and Gérard Depardieu is Žerar Depardje