Currently, a user can proceed to the next step (Languages) if he has selected a locutor.
However, the Languages step will appear "bugged" if the locutor does not have any spoken/signed languages.

Thus:

• the User should be prevented from proceeding to the Languages step if the locutor they have selected has 0 languages;
• an inline warning CdxMessage should be displayed in the "spoken/signed languages" CdxField explaining that the user will not be able to proceed with this locutor if they don't add at least a language to it.