The characters are not correctly encoded

1. Open the the wp-config.php in the WordPress root directory and check that the DB_CHARSET is defined to UTF8:

/** Database Charset to use in creating database tables. */
define('DB_CHARSET', 'utf8');

2. Go in your database and check that the charset of your database and all your tables is UTF8:

charset-database-1

charset-database-2

If everything looks OK but the problem is still there, we recommend that you report your issue on the specific language forum to know how native speakers handle these characters.