Adding more problematic characters.

sanitize-filename.php

<?php
/*
  Plugin Name:  No french punctuation and accents for filename
  Description:  Remove all french punctuation and accents from the filename of upload for client limitation (Safari Mac/IOS)
  Plugin URI:   http://www.beapi.fr
  Version:      1.0
  Author:       BeAPI
  Author URI:   http://www.beapi.fr

  /*
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  as published by the Free Software Foundation; either version 2
  of the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  
  
  * Sources: 
 * http://www.geekpress.fr/wordpress/astuce/suppression-accents-media-1903/
 * https://gist.github.com/herewithme/7704370
 
 * See also Ticket #22363
 * https://core.trac.wordpress.org/ticket/22363
 * and #24661 - remove_accents is not removing combining accents
 * https://core.trac.wordpress.org/ticket/24661
  
 */

add_filter( 'sanitize_file_name', 'remove_accents', 10, 1 );
add_filter( 'sanitize_file_name_chars', 'sanitize_file_name_chars', 10, 1 );

function sanitize_file_name_chars( $special_chars = array() ) {
	$special_chars = array_merge( array( '’', '‘', '“', '”', '«', '»', '‹', '›', '—', 'æ', 'œ', '€','é','à','ç','ä','ö','ü','ï','û','ô','è' ), $special_chars );
	return $special_chars;
}