5.1.0

[#165461]: Implement file type restrictions for logo and other image uploads as administrator
[#165351]: Fix a redirect loop issue with terms and one-time-password authentication
[#164880]: Fix an issue with IP address lookups for country information in the log view
[#164810]: Fix an issue with the mobile number when adding a new recipient to an existing CargoLink
[#137085]: Implement a URL shortcut for selected CargoLink recipients
[#137084]: Implement a SecureDrop feature to upload files in a postbox fashion
[#135607]: Fix a potential issue with invalid emails being added to the address book automatically