Metadata does not automatically drops control characters

[benoit74]

We should probably consider to automatically drop any control characters found in a string metadata (title, description, ...). Or raise an error...

[rgaudin]

On à 4,000 chars long description ???

[rgaudin]

But pretty sure we've already discussed it (with @kelson42) for the others. So I think it's not a question anymore and we should do it.