test: add snapshot test for all locales' character sets

[ST-DDT]

Fixes #1934

• Verify that the locale data use the correct characters #1934

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Adds a snapshot test that checks which characters are used by a locale.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.97%. Comparing base (1982431) to head (ae1bdad).
Report is 1 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3276   +/-   ##
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  Coverage   99.97%   99.97%           
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  Files        2811     2811           
  Lines      217414   217414           
  Branches      951      952    +1     
=======================================
  Hits       217359   217359           
  Misses         55       55           

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