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<?php
/* DON'T copy the first line (above) if your functions.php already has it. 
 * ---------------------------------------------------------------------- */
 
function et_get_safe_localization( $string ) {
	if ( false !== strpos( $string, 'New Message From ' ) ) {
		
		return 'YOUR CUSTOM EMAIL SUBJECT';
	
	}
	return wp_kses( $string, et_get_allowed_localization_html_elements() );
}