Restore index.html caching

[floreks]

No description provided.

[maciaszczykm]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[codecov]

Codecov Report

Merging #5729 (a01ad8d) into master (5da6193) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #5729      +/-   ##
==========================================
- Coverage   44.37%   44.35%   -0.03%     
==========================================
  Files         214      214              
  Lines        9124     9126       +2     
  Branches      113      113              
==========================================
- Hits         4049     4048       -1     
- Misses       4801     4803       +2     
- Partials      274      275       +1     

Impacted Files	Coverage Δ
src/app/backend/handler/localehandler.go	59.01% <0.00%> (-2.01%)	⬇️
src/app/frontend/login/component.ts	75.58% <0.00%> (-1.17%)	⬇️

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