Added i18n package

[daniellockyer]

refs #15502

• this is an early implementation of an i18n provider by exporting an instance of i18next
• there's a lot more to be done here but baby steps :)

[codecov]

Codecov Report

Base: 71.71% // Head: 71.72% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (6c1e6eb) compared to base (2dc9c7d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16145   +/-   ##
=======================================
  Coverage   71.71%   71.72%           
=======================================
  Files        1723     1727    +4     
  Lines      109240   109297   +57     
  Branches    16430    16445   +15     
=======================================
+ Hits        78341    78392   +51     
- Misses      29597    29602    +5     
- Partials     1302     1303    +1     

Flag	Coverage Δ
e2e-tests	85.00% <ø> (+<0.01%)	⬆️
unit-tests	55.31% <100.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
ghost/i18n/index.js	100.00% <100.00%> (ø)
ghost/i18n/lib/i18n.js	100.00% <100.00%> (ø)
ghost/i18n/locales/en.js	100.00% <100.00%> (ø)
ghost/i18n/locales/nl.js	100.00% <100.00%> (ø)
...tor/lib/tables/members-paid-subscription-events.js	89.74% <0.00%> (-10.26%)	⬇️
...a-generator/lib/tables/members-subscribe-events.js	94.33% <0.00%> (-5.67%)	⬇️
ghost/admin/app/components/gh-file-uploader.js	83.07% <0.00%> (-3.08%)	⬇️
...t/core/core/server/data/importer/import-manager.js	89.35% <0.00%> (-2.29%)	⬇️
ghost/admin/app/services/ajax.js	76.27% <0.00%> (-1.77%)	⬇️
ghost/data-generator/lib/tables/members.js	98.48% <0.00%> (-1.52%)	⬇️
... and 7 more

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