front: center text on stdcm error

[sim51]

fix #10135 for the text alignment

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.47%. Comparing base (a4190de) to head (86446e3).
Report is 5 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10272      +/-   ##
==========================================
- Coverage   81.48%   81.47%   -0.02%     
==========================================
  Files        1058     1058              
  Lines      104270   104270              
  Branches      722      722              
==========================================
- Hits        84969    84954      -15     
- Misses      19260    19275      +15     
  Partials       41       41              

Flag	Coverage Δ
editoast	73.68% <ø> (-0.05%)	⬇️
front	89.21% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.05% <ø> (ø)

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[SharglutDev]

Lgtm and tested, you can close the comment after fixing it :)