fix(statuses): align http status text with current standard

[fredbi]

This concerns dodgy status code 451, now realigned to its current definitions.

• fixes 451 is "Unavailable for legal reasons" not "Wrong exchange server" #122

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.71%. Comparing base (c69b34d) to head (beb4fc0).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #427   +/-   ##
=======================================
  Coverage   81.71%   81.71%           
=======================================
  Files          50       50           
  Lines        3397     3397           
=======================================
  Hits         2776     2776           
  Misses        508      508           
  Partials      113      113           

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