Fix deply redirect and error messages

[maciaszczykm]

Solves the issue mentioned in #4328 (comment).

[floreks]

/lgtm

[k8s-ci-robot]

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

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[codecov]

Codecov Report

Merging #5033 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5033      +/-   ##
==========================================
+ Coverage   45.41%   45.42%   +0.01%     
==========================================
  Files         214      214              
  Lines       10055    10078      +23     
  Branches       96      100       +4     
==========================================
+ Hits         4566     4578      +12     
- Misses       5222     5232      +10     
- Partials      267      268       +1

Impacted Files	Coverage Δ
src/app/frontend/common/errors/errors.ts	53.84% <ø> (ø)	⬆️
...p/frontend/common/services/global/notifications.ts	35.84% <0%> (-2.25%)	⬇️
.../app/frontend/common/components/graph/component.ts	62.19% <0%> (-1.19%)	⬇️
.../frontend/common/services/global/globalsettings.ts	39.53% <0%> (+0.64%)	⬆️
src/app/backend/settings/handler.go	33.33% <0%> (+2.08%)	⬆️

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[floreks]

Fixes #4282