Translations:Survey settings version 2/24/en

Important hints:
 * Authorized files extensions are defined in config-defaults.php.
 * Files for the survey are in the upload/surveys/ subdirectory.
 * Uploaded files will only been seen while browsing resources on this survey (groups, questions, answers) not in other surveys or objects (labels).
 * Do not expect this limited visibility to ensure confidentiality of the resources as they are reachable with a simple browser to anyone who know the URL to the file.
 * You can't import a ZIP file containing subdirectories.