Improve locale checker report readability

[xavierfacq]

This is just a small modification to improve the readability of the report by setting UPPERCASE the name of the locale.

Will have:

• Uppercase in the table
• View the changes to the English file since the last "ES" update

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[codecov]

Codecov Report

Merging #2431 (48198fe) into main (a56e0d5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2431   +/-   ##
=======================================
  Coverage   99.20%   99.20%           
=======================================
  Files          87       87           
  Lines        6542     6542           
  Branches      552      552           
=======================================
  Hits         6490     6490           
  Misses         52       52           

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[karianna]

@xavierfacq linter needs to be made happy :-)