fix lots of file type icons for archives, js, flash, ics, fonts, code, ...

core/img/filetypes/application-javascript.png

core/img/filetypes/application-javascript.svg

core/img/filetypes/application-x-shockwave-flash.png

core/img/filetypes/application-x-shockwave-flash.svg

core/img/filetypes/text-calendar.png

core/img/filetypes/text-calendar.svg

lib/private/helper.php

lib/private/mimetypes.list.php