feat(i18n): setup for Chinese translation

[SangKa]

• Setup for Chinese languages (zh)
• Translate the Home and Installation page
• Create the files for the operators

The next step is the operators translation.

[codecov-io]

Codecov Report

Merging #308 into master will decrease coverage by 0.83%.
The diff coverage is 25%.

@@            Coverage Diff             @@
##           master     #308      +/-   ##
==========================================
- Coverage   90.78%   89.95%   -0.84%     
==========================================
  Files         116      116              
  Lines         445      448       +3     
  Branches        9        9              
==========================================
- Hits          404      403       -1     
- Misses         40       43       +3     
- Partials        1        2       +1

Impacted Files	Coverage Δ
src/app/core/data/language.data.ts	100% <ø> (ø)	⬆️
src/app/core/services/operators.service.ts	88.23% <0%> (-11.77%)	⬇️
src/app/core/services/language.service.ts	96.55% <100%> (ø)	⬆️

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[niklas-wortmann]

LGTM but I can't check the translations