Translations:Installation - LimeSurvey CE/11/en

Optional PHP Extensions:
 * GD-Library with FreeType support installed is needed for captchas, nice charts in statistics or to upload images via the HTML editor - see PHP GD-Library Extension documentation
 * IMAP (pretty standard) is needed for the email bounce tracking system - see PHP IMAP Extension documentation
 * LDAP installed is needed to import survey participants using LDAP - see PHP LDAP Documentation
 * Zip (pretty standard) is needed for template upload, import of .zip archived resources, and excel export - see PHP Zip Extension documentation
 * Zlib (pretty standard) is needed for the ComfortUpdate - see PHP Zlib Extension documentation