List of changes:

-Added 2 factor authentication for Mega.
-Fixed Mega can not login in some accounts.
-Fixed uploading some files to Box did not work.
-Exponential backoff retry control for Box.
-Reduced the number of API requests in Google Drive.
-Reduced the number of API requests in Box.
-Reduced the number of API requests in Dropbox.
-Reduced the number of API requests in OneDrive.
-Better handling of 403 errors on Google Drive.
-Added Slovak language (Thanks to Miro).