NogDog
I resolved the widget by changing this code
public function shortcode( $atts, $content = null ) {
$defaults = array( 'currency_codes' => '', 'message' => '', 'show_symbols' => '0', 'show_reset' => '0', 'currency_display' => '', 'disable_location' => '0' );
$settings = shortcode_atts( $defaults, $atts );
return $this->get_converter_form( $settings, false );
}
to 'show_symbols' => '1',
This seems to work.
The only problem now is that on product filters still get the currency at EUR & GBP and not with symbols