editing datatype contents

[bwbohl]

• When editing datatypes there is no option to add a semi-closed list; when uploading a customisation with such a semiclosed list it will be displayed as a closed list which is irritating.
• moreover there is no possibility to add tei:glossor tei:descin the GUI

[raffazizzi]

The datatype interface is admittedly underdeveloped compared to the rest.