Usage of legacy theme descriptor no longer causes error in theme build

If you were still using a theme descriptor instead of the new (and recommended) theme configuration a recent upgrade of our third party tools caused the theme build to fail. This has been fixed now.

(CMS-19020)

Underscore in folder name is no longer taken into account for properties files

Building the Frontend Workspace has led to problems regarding the file name of resource bundles if one of the folders has contained an underscore. This has been fixed now.

(CMS-18852)