Changed description text for email login field, removed "Optional" as this is a required field.

interface/web/mail/lib/lang/de_mail_user.lng

@@ -37,7 +37,7 @@ $wb['cc_txt'] = 'Send copy to';
 $wb['cc_error_isemail'] = 'The Send copy to field does not conatin a valid email address';
 $wb['login_error_unique'] = 'Login wird bereits verwendet.';
 $wb['login_error_regex'] = 'Zulässige Zeichen sind A-Z, a-z, 0-9, ., _ und -.';
-$wb['login_txt'] = 'Login (optional)';
+$wb['login_txt'] = 'Login';
 $wb['error_login_email_txt'] = 'Dieser Loginname ist nicht zulässig. Bitte verwenden Sie einen anderen Loginnamen oder die E-Mail-Adresse als Login.';
 $wb['domain_txt'] = 'Domain';
 $wb['now_txt'] = 'Now';

interface/web/mail/lib/lang/en_mail_user.lng

@@ -39,6 +39,6 @@ $wb['domain_txt'] = 'Domain';
 $wb['now_txt']='Now';
 $wb['login_error_unique'] = 'Login is already taken.';
 $wb['login_error_regex'] = 'Valid characters are A-Z, a-z, 0-9, ., _ and -.';
-$wb['login_txt'] = 'Login (optional)';
+$wb['login_txt'] = 'Login';
 $wb['error_login_email_txt'] = 'This login is not allowed. Please enter a different login or use the mail address as login.';
 ?>