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It's now possible to easily set/add properties and save the respective files, also it's easy to access and modify the properties description.
Pull Request
https://github.com/DSpace/DSpace/pull/61
NOTE: The under development SpringUI and its associated features made us recognize that, changing the core ConfigurationManager, is an important change to make DSpace more user friendly in the future.https://github.com/DSpace/DSpace/pull/61