Make category notification choices language consistent

Right now the language to describe category notification choices differs slightly between the category page and a user’s preferences page.

On the category page Discourse uses

  • Watching
  • Tracking
  • Watching First Post
  • Normal
  • Muted

On the user preferences page Discourse uses

  • Watched
  • Tracked
  • Watching First Post
  • Regular

The biggest discrepancy is do we use “Normal” or “Regular”?