Say how long names can be

On https://wafertest.debconf.org/register/step-1

Contact Information
My name is*
This will appear on your name tag, and in public areas of this site, e.g. if you submit a talk.
Nametag line 2
This could be your company, project, preferred pronoun or anything you'd like to say.

The user wonders "Should I fill in a short version, or a long version of my company's name?"

"I would fill in a long version, but I'm worried it will run off the end of the name tag and look ugly."

"I wish they would state the width limits of the fields. And say if they are counting ASCII or CJK widths"