Updates for upload_interaction: - allow lecturer to specify number of file, which can be uploaded - handle singular/plural labels for attachment/attachments - handle singular/plural labels for Students submitting files - styling improvements - bump version number to get as well message catalog updates from xowiki
since the form-field "file" supports the file multiple attribute, the internal representation is as well a list. this change takes now as file-name for the local renderer as well the first file name list element.