add france for language selector

[helight]

const SUPPORTED_LANGUAGES: LanguageConfig[] = [
{
label: 'German',
value: 'de',
},
{
label: 'French',
value: 'fr',
},
....

[codecov]

Codecov Report

Merging #5696 (6b5a4c1) into master (5264516) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5696      +/-   ##
==========================================
- Coverage   44.36%   44.35%   -0.02%     
==========================================
  Files         214      214              
  Lines        9124     9124              
  Branches      113      113              
==========================================
- Hits         4048     4047       -1     
- Misses       4801     4802       +1     
  Partials      275      275              

Impacted Files	Coverage Δ
src/app/frontend/index.config.ts	100.00% <ø> (ø)
...p/backend/integration/metric/common/aggregation.go	88.00% <0.00%> (-2.00%)	⬇️

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[maciaszczykm]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: helight, maciaszczykm

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