Staging feedback: LTS Provider

From #197 (closed)

/node/%lts_provider/edit

• Maintenance provider name / Company Name should be required
• URL field descriptions are misleading. These should always be external URL. It should not be possible to select an internal path for these fields.
  • Same for the Project URL
• The add LTS supported projects button should be labeled as + Add another item

/node/%lts_provider/view

• The country/Region field is missing in the description section
• Supported Project field group is missing
• Keep the Additional detail section and add the missing Submitted by: field.
• Disable comments for this content-type.