front: fix translations for pathfinding error in itinerary

[RomainValls]

closes #9728

[emersion]

The error message still isn't human-readable for me:

I think we need to set message to t(`pathfindingErrors.${…}`) instead.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 37.86%. Comparing base (36eb346) to head (eb40dab).
Report is 3 commits behind head on dev.

Files with missing lines	Patch %	Lines
...nt/src/modules/pathfinding/hooks/usePathfinding.ts	0.00%	8 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #9729      +/-   ##
==========================================
- Coverage   37.87%   37.86%   -0.02%     
==========================================
  Files         990      990              
  Lines       90961    90966       +5     
  Branches     1176     1176              
==========================================
- Hits        34450    34442       -8     
- Misses      56057    56070      +13     
  Partials      454      454              

Flag	Coverage Δ
editoast	73.30% <ø> (-0.03%)	⬇️
front	20.10% <0.00%> (-0.01%)	⬇️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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[emersion]

LGTM!