Add more help texts for dialogs to suggest new cv entries
In the discussion with Paul & Heiko for the functionality in the SMS & CV, we realized that additional help texts would be very beneficial, as most users don't know about what to insert in those fields.
Especially the provenence uri could be labeled, so that the people know that they could add links for example to nerc.
But additional information would also be helpful for category for example.
And in general the users should know that they don't need to insert all the information. But in case they can provide it, then it would be helpful for the CV responsible persons.