fixed wrong var usage in fscode.php

Signed-off-by: Sweil <mail@sweil.de>
don't convert linebreaks with fscode disabled

Signed-off-by: Sweil <mail@sweil.de>
fehlende texte ergänzt

Signed-off-by: Sweil <mail@sweil.de>
fixed nasty bug which prevents captcha from working

Signed-off-by: Sweil <mail@sweil.de>
add missing English (US) language texts

This commit corresponds to the changes that were made to the
German language file in commit f7599de3af.