Update 'lang/es/iassign.php'

$string['new_comment']                    = 'Recados nuevos';
Several messages was in English, translated to Spanish:
Spanish: $string['new_comment_mail_answer']        = 'Respuesta';
Nova: $string['new_comment_mail_at']            = 'no';
Spanish: $string['new_comment_mail_course']        = 'Curso';
Spanish: $string['new_comment_mail_open_exercise'] = 'Ejercicio abierto';
Spanish: $string['new_comment_mail_sent_by']       = 'Enviado por';
$string['new_comment_mail_subject']       = 'Nueva mensaje recibida en actividad';

lang/es/iassign.php

@@ -422,11 +422,12 @@ $string['N_legend']                       = '(no esta en acuerdo en relación a
 $string['name_ilm']                       = 'Nombre';
 $string['new_category']                   = 'Nueva categoria';
 $string['new_comment']                    = 'Recados nuevos';
-$string['new_comment_mail_answer']        = 'Answer';
-$string['new_comment_mail_course']        = 'Course';
-$string['new_comment_mail_open_exercise'] = 'Open exercise';
-$string['new_comment_mail_sent_by']       = 'Sent by';
-$string['new_comment_mail_subject']       = 'New received message';
+$string['new_comment_mail_answer']        = 'Respuesta';
+$string['new_comment_mail_at']            = 'no';
+$string['new_comment_mail_course']        = 'Curso';
+$string['new_comment_mail_open_exercise'] = 'Ejercicio abierto';
+$string['new_comment_mail_sent_by']       = 'Enviado por';
+$string['new_comment_mail_subject']       = 'Nueva mensaje recibida en actividad';
 $string['new_dir']                        = 'Nuevo directorio';
 $string['new_file_jar']                   = 'Nuevo Fichero JAR';
 $string['new_ilm']                        = 'Crea una nueva actividad interactiva';