This software will allow you to decrypt the Serato SSL Database and will create a new file specifically for Traktor based off the Serato database, including cues, etc.

From the author:

Due to popular demand, we have created a “Traktor SSL Database Importer”. This application can import the database, specific crates and individual folders from any SSL 1.9.1 installation complete with cue point and loop information into Traktor Pro/Duo/LE version 1.1.2 and upwards.

If you get an error when trying to install (confirmed to happen on Mac OSX El Capitan 10.11), you will need to install the package manually by extracting it (right click and select Show Package Contents), or download it below.

Application:
https://smyl.es/downloads/download-info/seratotraktor-ssl-database-importer-for-mac-osx-application/

Documentation:
https://smyl.es/downloads/download-info/seratotraktor-ssl-database-importer-for-mac-osx-documentation/

This software is for Mac OSX specifically, the Windows download link is here:

https://smyl.es/downloads/download-info/serato-to-traktor-ssl-database-importer-for-windows/