Explanation file, changes.txt added. Code unchanged.
Forgot to say,
5. La fonction tep_db_connect() dans includes/functions/database.php et admin/includes/functions/database.php a une nouvelle ligne : mysql_query("SET NAMES 'UTF8'") ;
6. Les biloutes ne se trouvent plus en Bretagne.
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5. The function tep_db_connect() in includes/functions/database.php and admin/includes/functions/database.php has a new line : mysql_query("SET NAMES 'UTF8'") ;

6. A small correction was made to the zones table (59 changed to 56) for Brittany.

Nota bene :
There is another contribution that provides just the two database.php files and suggests alternatively to add two more lines in tep_db_connect().

mysql_query("SET CHARACTER_SET_CLIENT=utf8");
mysql_query("SET CHARACTER_SET_RESULTS=utf8");

after

mysql_query("SET NAMES 'utf8'");

but since it worked ok for me without them I did not put them in.
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