Visualize better the missing required field in the contact form

[useppi]

In the Contact Form under https://freesoftwarelab.noi.bz.it/contact/ it is not possible to invoke a contact request if a required field is missing. This is right, but the problem is, that the missing field is not highlighted as usually.
Please highlight missing required fields when somebody tries to submit the form in the same way as in the Service Request form under https://freesoftwarelab.noi.bz.it/services/

[lelebus]

I just pulled from your master but I don't find this problem.