Feature: Support for language selection

[shilob]

Portal language can now be changed through the language picker dropdown.

Supported languages are configured via the sails.config.i18n.next.init block, specifically: supportedLngs and preload arrays.

The corresponding language file must also exist in the assets/locale/<language code>/translation.json path.

Finally, to display the language option in the drop down list, the language code label text must also exist in the language file itself, in the format lang-<language code>.

A few included chores:

• Bootstrap of TranslationService is now async
• Dev-specific client app build scripts can output to Sails' temp dir
• welcome-title language file entry now supports HTML content

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04% 🎉

Comparison is base (d0ecc83) 70.00% compared to head (1bcb201) 70.05%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1524      +/-   ##
===========================================
+ Coverage    70.00%   70.05%   +0.04%     
===========================================
  Files          110      111       +1     
  Lines         1867     1870       +3     
  Branches       218      218              
===========================================
+ Hits          1307     1310       +3     
  Misses         560      560              

Flag	Coverage Δ
frontend-core-lib	52.41% <100.00%> (+0.10%)	⬆️
frontend-dashboard	88.07% <ø> (ø)
frontend-export	100.00% <ø> (ø)
frontend-local-auth	100.00% <ø> (ø)
frontend-manage-roles	63.33% <ø> (ø)
frontend-manage-users	59.81% <ø> (ø)
frontend-report	100.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
config/auth.js	100.00% <ø> (ø)
config/i18n.js	100.00% <ø> (ø)
config/policies.js	100.00% <ø> (ø)
...ox/portal-ng-common/src/lib/translation.service.ts	84.90% <100.00%> (+0.29%)	⬆️
api/policies/setLang.js	100.00% <100.00%> (ø)
config/bootstrap.js	85.88% <100.00%> (ø)

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