CSV Export with special characters(german/french umlauts) and different delimiter

I had troubles getting correct csv export with our special german and french chars like äöü éè etc. to display correctly in output
So i changed following in code and it works for me perfectly, but as i am absolutely drupal beginner, I hope any of you professionals can review it.

file webform_report.inc
~line 865: required other delimiter for my excel2010 to recognize automatically
$output .= implode(',', $tmp) . "\n";
to new
$output .= implode(';', $tmp) . "\n";

~line 862-864: required to convert characters correctly
foreach($row as $cell) {
$tmp[] = _webform_report_format_csv_column(strip_tags($cell['data']));
}
to new
foreach($row as $cell) {
if (function_exists('mb_convert_encoding')) {
$tmp[] = _webform_report_format_csv_column(strip_tags(mb_convert_encoding($cell['data'], 'UTF-16LE', 'UTF-8')));
}
else {
$tmp[] = _webform_report_format_csv_column(strip_tags($cell['data']));
}
}

~line 857: same for header
$output .= implode(',', $tmp) . "\n";
to new
$output .= implode(';', $tmp) . "\n";

~line 854-856
foreach($headers as $header) {
$tmp[] .= _webform_report_format_csv_column($header['data']);
}
to new
foreach($headers as $header) {
if (function_exists('mb_convert_encoding')) {
$tmp[] .= _webform_report_format_csv_column(mb_convert_encoding($header['data'], 'UTF-16LE', 'UTF-8'));
}
else {
$tmp[] .= _webform_report_format_csv_column($header['data']);
}
}