Did you find a solution for this?
I'm hoping it's a 'beta' issue, and that it'll be solved when the full version is out.
I found a solution for this problem.
Apparently livecycle needs the data.properties file which is by default located in web-inf\flex\locale\en_US\fds_rb.swc. You can create a folder with your own locale and extract the files from the swc file into this folder. The swc file is an archive, so no problem here. Then you have to change the path attribute from the files\file element in catalog.xml to locale/your_locale/data.properties. Also change the folder name from en_US to your_locale, you'll find this under locale. Next add the web-inf\flex\locale\your_locale folder to your project libraries (add swc folder).
Thanks for pointing me to the right direction!