Description of problem:

It was my impression, that every "object" in katello has a name,
that allows i18n characters, and label that allows only alphanumerics for compatiblity with pulp/yum backends.

Right now, situation looks like this:

Custom provider form
  doesn't have label
  alphanumerics-only constraint is enforced on its name.

Custom product form
  has label field
  alphanumeric-only constraint is enforced on its name
  when trying to supply name \w i18n chars, valid label is created (include Ext::LabelFromName), but creation is forbidden

Custom repo form
  has label field
  there are no constraints on name (I can create repository with name Русский, or 洪)
  valid label is automaticaly created, if containing i18n chars, by hashing

Expected results:

According to test-cases

https://tcms.engineering.redhat.com/case/211097, 
https://tcms.engineering.redhat.com/case/181838

provider, product and repo names should accept i18n names.

Katello Version: 1.4.1-1.git.151.5330760.el6