More concise User registration help note explanation [ci skip]

Only updates language translations not already
converted from English and adds a clearer path
to where in admin to add users manually.
Update Display Settings admin to use config/locale lang files

- Don't need to say Display count settings are "by default"
  unless it can be changed elsewhere in admin

- Remove "my" as this should reflect settings for whole blog

- FeedBurner includes capital B
Merge pull request #303 from randomecho/admin-settings-explanation

Update Display Settings admin to use config/locale lang files