[wp-trac] [WordPress Trac] #44640: Use current `.notice` CSS classes for settings errors

[WordPress Trac]

#44640: Use current `.notice` CSS classes for settings errors
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 Reporter:  flixos90        |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Administration  |    Version:
 Severity:  normal          |   Keywords:  2nd-opinion
  Focuses:                  |
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 The CSS classes `error` and `updated` for settings errors are legacy, as
 numerous releases ago more proper classes `notice`, `notice-success`,
 `notice-error` etc. were introduced. However, the `settings_errors()`
 function still prints divs with the old classes.

 We should consider adjusting that for consistency:
 * Map `updated` to `notice-success`.
 * Map `error` to `notice-error`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/44640>
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