Please see the attached screenshot. Although I set the language into Spanish, the English word of 'Contributor' is displayed.
Steps to reproduce:
1. Move to 'Site Info'->'Manage Groups', and create a group.
2. Set the language into Spanish (Spain) from 'My Workspace'
>'Preferences' or 'Site Info'>'Edit Site Information'.
3. Move to Foros (Forums).
4. Select 'Nuevo tema' (New Topic)
>'Crear temas para grupos automáticamente' (Automatically create multiple topics for groups)>'Más' (More?).
5. Then the 'Contributor' is displayed. It should be 'Colaborador' in Spanish.