2.8.3

• Remove unused underscore.js
• Bump IntroJS to 7.2.0
• Upgrade jquery-validate to 1.21.0
  • Add messages for Arabic language
  • Add methods_ln.js files with regexps for DE, NL, and PT languages
  • Modify admin layout view to load the methods_ln.js file with a javascript_include_tag if the file exists
• Fix uploads to AWS S3 folders
  • Also, introduced the path traversal validation to the add_folder method, which was found unsafe

Full Changelog: 2.8.2...2.8.3