Edit widgets format dates in English always (causing validation errors or data corruption)

Currently when editing a node with a date field, the date value that comes from the database appears only in english, even if you have your website with another language as the default language and you have the completed translation of the date module. This problem appears when you have created your date field with one of these widget types: "Text Field with custom input format" or "Text Field with Date Pop-up calendar". In my case my website is only in spanish and everytime the users want to edit a node with a date field, even if the date is correct they have to change it because it appears in english and if they press the button Save (Guardar) without doing it then the website shows an error saying that the date they have entered is not valid. As you can see this is totally against usability and is definitely a headache for our users.

The reason of the problem is that this module is using a PHP function that only works in english, date_format().
I managed to solve this issue modifying 2 lines of code and adding 2 small functions to the date_popup.module file, wich is inside the module/date/date_popup folder. In my case i only needed to translate the month names so i didn't change the day names.

I hope this people include this fix (or a better one)

Lines changed:
247: '#default_value' => (!empty($element['#value']['date']) || !empty($edit['date'])) && is_object($date) ? traducir_fecha(date_format($date, $date_format)) : '',

259: $sub_element['#description'] = ' '. t('Format: @date', array('@date' => traducir_fecha(date($date_format, time()))));

This one is for the hint message that appear below the date field.

The 2 small functions are:

<pre>
/*Added by Efrain Herrera - Latinosoft
 * latinosoft@gmail.com
 * latinosoft@latinosoftpsa.com
 * Colombia
 * 
 * Changes the months to the regexp format
 * */

function cambiar_a_regexp(&$valor,$key){
	$valor= '/'.$valor.'/';
}


/*Added by Efrain Herrera - Latinosoft
 * latinosoft@gmail.com
 * latinosoft@latinosoftpsa.com
 * Colombia
 * 
 * Translate month names from english to your user's language
 * */
function traducir_fecha($fecha){	
	//the date_month_names_untranslated function is defined in the date_api.module file
	//the date_month_names and date_month_names_abbr functions are defined in the date_api.module file

	//we created an array with the month names wich is used as patterns
	$patterns = date_month_names_untranslated()+array('Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec');
	//we added the / character before and after each month name. (this is to match the preg_replace regexp format)
	array_walk($patterns,'cambiar_a_regexp');
	
	//we created an array with the same values translated
	$replacements = date_month_names(TRUE)+date_month_names_abbr(TRUE);

	return preg_replace($patterns, $replacements, $fecha);
}
</pre>