public static function get_currencies()
 {
     if (!self::$_currencies) {
         self::$_currencies = apply_filters('app-template-currencies', array('AUD' => __('AUD - Australian Dollar', 'appointments'), 'BRL' => __('BRL - Brazilian Real', 'appointments'), 'CAD' => __('CAD - Canadian Dollar', 'appointments'), 'CHF' => __('CHF - Swiss Franc', 'appointments'), 'CZK' => __('CZK - Czech Koruna', 'appointments'), 'DKK' => __('DKK - Danish Krone', 'appointments'), 'EUR' => __('EUR - Euro', 'appointments'), 'GBP' => __('GBP - Pound Sterling', 'appointments'), 'ILS' => __('ILS - Israeli Shekel', 'appointments'), 'HKD' => __('HKD - Hong Kong Dollar', 'appointments'), 'HUF' => __('HUF - Hungarian Forint', 'appointments'), 'JPY' => __('JPY - Japanese Yen', 'appointments'), 'MYR' => __('MYR - Malaysian Ringgits', 'appointments'), 'MXN' => __('MXN - Mexican Peso', 'appointments'), 'NOK' => __('NOK - Norwegian Krone', 'appointments'), 'NZD' => __('NZD - New Zealand Dollar', 'appointments'), 'PHP' => __('PHP - Philippine Pesos', 'appointments'), 'PLN' => __('PLN - Polish Zloty', 'appointments'), 'SEK' => __('SEK - Swedish Krona', 'appointments'), 'SGD' => __('SGD - Singapore Dollar', 'appointments'), 'TWD' => __('TWD - Taiwan New Dollars', 'appointments'), 'THB' => __('THB - Thai Baht', 'appointments'), 'TRY' => __('TRY - Turkish lira', 'appointments'), 'USD' => __('USD - U.S. Dollar', 'appointments')));
     }
     return self::$_currencies;
 }