Why can't I buy a map?

Hint 1 of 5:

First, you should have completed the end game before you read any
further.

Hint 2 of 5:

You need money.

Hint 3 of 5:

Give the 50 franc note to the man.

Hint 4 of 5:

Now ask for a map.

Hint 5 of 5:

Hmm, the French are proud of their language.  You need to ask
in French.  You may pick up a clue by using the rod of language on
the man.