5.2.16

[#235037]: Ensure responses to HEAD requests always deliver a Content-Length header
[#234858]: Add a link to all CargoLinks in the dashboard when in “transfer only” mode
[#234709]: Fix a mime type detection issue with text based files for JSON, XML and CSS types
[#231995]: Add a configuration option per user to enforce PIN and mobile number usage for CargoLinks
[#231993]: Add a configuration option to enforce PIN and mobile number usage for CargoLinks when receiving files
[#231992]: Add a configuration option to enforce PIN and mobile number usage for CargoLinks when sending files