Feature: Support internationalization

[timotheeguerin]

fix #1499

[codecov]

Codecov Report

Merging #1500 into master will increase coverage by 0.08%.
The diff coverage is 91.04%.

@@            Coverage Diff             @@
##           master    #1500      +/-   ##
==========================================
+ Coverage   60.24%   60.33%   +0.08%     
==========================================
  Files        1054     1065      +11     
  Lines       24823    24888      +65     
  Branches     3434     3437       +3     
==========================================
+ Hits        14954    15015      +61     
- Misses       9869     9873       +4

Impacted Files	Coverage Δ
app/services/themes/theme.service.ts	18.6% <ø> (+0.21%)	⬆️
...sk/ui/duration-picker/duration-picker.component.ts	88.96% <ø> (ø)	⬆️
app/services/batch-labs.service.ts	15.15% <0%> (+2.65%)	⬆️
src/@batch-flask/core/index.ts	100% <100%> (ø)	⬆️
src/@batch-flask/ui/i18n/i18n-ui.module.ts	100% <100%> (ø)
src/@batch-flask/ui/i18n/i18n.pipe.ts	100% <100%> (ø)
app/services/index.ts	100% <100%> (ø)	⬆️
src/@batch-flask/core/i18n/index.ts	100% <100%> (ø)
...flask/ui/duration-picker/duration-picker.module.ts	100% <100%> (ø)	⬆️
src/@batch-flask/ui/index.ts	100% <100%> (ø)	⬆️
... and 22 more

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