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The name should be "Sir William Jones." Also, the final phrase should be "what is this language."

http://en.wikipedia.org/wiki/William_Jones_(philologist)

Also, a correction of facts (maybe added as a note, it's not a translation error)... the year was 1786, not 1886. But that's just a factual error, not a translation error.

Yes, you're right
"Sir William Jones"
i don't know what I was thinking right then!
As for the tense used in the last phrase it was that I used a past tense for the sentence and I wouldn't love to mix the tenses:
past and present!