add missing lng-string (Fixes: 4120)

Author: Florian Schaal

interface/web/help/lib/lang/ar_support_message.lng

@@ -12,4 +12,5 @@ $wb['answer_to_support_request_txt'] = 'You have got a reply to your support req
 $wb['answer_to_support_request_sent_txt'] = 'Your reply to the support request has been sent. Please don\'t reply to this email.';
 $wb['support_request_sent_txt'] = 'Your support request has been sent. Please don\'t reply to this email.';
 $wb['recipient_or_sender_email_address_not_valid_txt'] = 'The message could not be sent because the recipient and/or the sender email address is not valid.';
+$wb['subject_is_empty'] = 'The subject can not be empty.';
 ?>

interface/web/help/lib/lang/bg_support_message.lng

@@ -12,4 +12,5 @@ $wb['answer_to_support_request_txt'] = 'You have got a reply to your support req
 $wb['answer_to_support_request_sent_txt'] = 'Your reply to the support request has been sent. Please don\'t reply to this email.';
 $wb['support_request_sent_txt'] = 'Your support request has been sent. Please don\'t reply to this email.';
 $wb['recipient_or_sender_email_address_not_valid_txt'] = 'The message could not be sent because the recipient and/or the sender email address is not valid.';
+$wb['subject_is_empty'] = 'The subject can not be empty.';
 ?>

interface/web/help/lib/lang/br_support_message.lng

@@ -12,4 +12,5 @@ $wb['answer_to_support_request_txt'] = 'You have got a reply to your support req
 $wb['answer_to_support_request_sent_txt'] = 'Your reply to the support request has been sent. Please don\'t reply to this email.';
 $wb['support_request_sent_txt'] = 'Your support request has been sent. Please don\'t reply to this email.';
 $wb['recipient_or_sender_email_address_not_valid_txt'] = 'The message could not be sent because the recipient and/or the sender email address is not valid.';
+$wb['subject_is_empty'] = 'The subject can not be empty.';
 ?>

interface/web/help/lib/lang/ca_support_message.lng

@@ -12,4 +12,5 @@ $wb['answer_to_support_request_txt'] = 'Vous avez une réponse à votre demande
 $wb['answer_to_support_request_sent_txt'] = 'VOtre message à été envoyé au support.';
 $wb['support_request_sent_txt'] = 'Votre réponse à la demande d\'assistance a été envoyée. Merci de ne pas répondre à cet courriel.';
 $wb['recipient_or_sender_email_address_not_valid_txt'] = 'Le message n\'a pas pu être envoyé parce que l\'adresse courriel du destinataire et/ou de l\'émetteur est invalide.';
+$wb['subject_is_empty'] = 'The subject can not be empty.';
 ?>

interface/web/help/lib/lang/cz_support_message.lng

@@ -12,7 +12,5 @@ $wb['answer_to_support_request_txt'] = 'You have got a reply to your support req
 $wb['answer_to_support_request_sent_txt'] = 'Your reply to the support request has been sent. Please don\'t reply to this email.';
 $wb['support_request_sent_txt'] = 'Your support request has been sent. Please don\'t reply to this email.';
 $wb['recipient_or_sender_email_address_not_valid_txt'] = 'Zprávu nelze odeslat, protože e-mailová adresa příjemce a/nebo odesílatele není platná.';
+$wb['subject_is_empty'] = 'The subject can not be empty.';
 ?>
-
-
-

interface/web/help/lib/lang/de_support_message.lng

@@ -12,4 +12,5 @@ $wb['answer_to_support_request_txt'] = 'Sie haben eine Antwort auf Ihre Supporta
 $wb['answer_to_support_request_sent_txt'] = 'Ihre Antwort auf die Supportanfrage ist verschickt worden. Bitte antworten Sie nicht auf diese E-Mail.';
 $wb['support_request_sent_txt'] = 'Ihre Supportanfrage ist verschickt worden. Bitte antworten Sie nicht auf diese E-Mail.';
 $wb['recipient_or_sender_email_address_not_valid_txt'] = 'Die Nachricht konnte nicht verschickt werden, da die Empfänger- und/oder die Sender E-Mail-Adresse nicht gültig ist.';
+$wb['subject_is_empty'] = 'Betreff darf nicht leer sein.';
 ?>

interface/web/help/lib/lang/dk_support_message.lng

@@ -12,4 +12,5 @@ $wb['answer_to_support_request_txt'] = 'Du har fået et svar på din support anm
 $wb['answer_to_support_request_sent_txt'] = 'Dit svar på support anmodningen er blevet sendt. Venligst, besvare ikke denne e-mail.';
 $wb['support_request_sent_txt'] = 'Din support anmodning er blevet sendt. Venligst, besvare ikke denne e-mail.';
 $wb['recipient_or_sender_email_address_not_valid_txt'] = 'Meddelelsen kunne ikke sendes, fordi modtageren og/eller afsenderens e-mail adresse ikke er gyldig.';
+$wb['subject_is_empty'] = 'The subject can not be empty.';
 ?>

interface/web/help/lib/lang/el_support_message.lng

@@ -12,4 +12,5 @@ $wb['answer_to_support_request_txt'] = 'You have got a reply to your support req
 $wb['answer_to_support_request_sent_txt'] = 'Your reply to the support request has been sent. Please don\'t reply to this email.';
 $wb['support_request_sent_txt'] = 'Your support request has been sent. Please don\'t reply to this email.';
 $wb['recipient_or_sender_email_address_not_valid_txt'] = 'The message could not be sent because the recipient and/or the sender email address is not valid.';
+$wb['subject_is_empty'] = 'The subject can not be empty.';
 ?>

interface/web/help/lib/lang/en_support_message.lng

@@ -12,4 +12,5 @@ $wb['answer_to_support_request_txt'] = 'You have got a reply to your support req
 $wb['answer_to_support_request_sent_txt'] = 'Your reply to the support request has been sent. Please don\'t reply to this email.';
 $wb['support_request_sent_txt'] = 'Your support request has been sent. Please don\'t reply to this email.';
 $wb['recipient_or_sender_email_address_not_valid_txt'] = 'The message could not be sent because the recipient and/or the sender email address is not valid.';
+$wb['subject_is_empty'] = 'The subject can not be empty.';
 ?>

interface/web/help/lib/lang/es_support_message.lng

@@ -12,4 +12,5 @@ $wb['support_request_sent_txt'] = 'Su petición de soporte ha sido enviada. Por
 $wb['support_request_subject_txt'] = 'Petición de soporte';
 $wb['support_request_txt'] = 'Usted ha recibido una petición de soporte. Por favor no responda a este correo, puede comprobar la petición en el panel de control ISPConfig.';
 $wb['tstamp_txt'] = 'Marca de tiempo';
+$wb['subject_is_empty'] = 'The subject can not be empty.';
 ?>