Castor EDC/CDMS user interface is only available in English. However, you can build your study forms and surveys in any language.

You can read more about building your study forms and surveys in multiple languages in these articles:

• How to build study forms in multiple languages in EDC/CDMS
• How to build surveys in multiple languages in EDC/CDMS
   

Additionally, the survey data entry interface, messages and navigation can be easily switched between English, Dutch, French, Spanish, Portuguese, Italian, Russian, Polish, Swedish, and Czech. The survey translations apply to buttons and messages. Creating a translated version of the actual questions in the survey will need to be done by the person creating the questionnaire.