fix(frontend): update wording on calcul indemnité

[lionelB]

fix #338

[codecov]

Codecov Report

Merging #380 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #380   +/-   ##
======================================
  Coverage    46.6%   46.6%           
======================================
  Files          63      63           
  Lines         796     796           
  Branches      113     113           
======================================
  Hits          371     371           
  Misses        384     384           
  Partials       41      41

Impacted Files	Coverage Δ
...frontend/src/outils/indemniteLicenciement/index.js	0% <ø> (ø)	⬆️
...src/outils/indemniteLicenciement/DateFinContrat.js	0% <ø> (ø)	⬆️
...ntend/src/outils/indemniteLicenciement/ChoixCCN.js	0% <ø> (ø)	⬆️
...d/src/outils/indemniteLicenciement/ResultDetail.js	0% <ø> (ø)	⬆️
.../outils/indemniteLicenciement/ccn/AffilationOpe.js	0% <ø> (ø)	⬆️

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