Add <label> elements to checkboxes and radio buttons

[kimhornung]

The various forms don't have elements for the input fields.
For checkboxes and radio buttons, this means that you have to click the actual checkbox or radio button.
With this fix, you'll be able to click the label text next to the radio checkboxes and radio buttons to select them.

I've only fixed this for checkboxes and radio buttons, not for text fields.

Affected areas:

• Network settings
• Manage training (Quick Create Training section)
• Managa training details (Invitation Details section)
• Embed training dialog