CIF-1148 - i18n support for AEM server-side Core Components

[cjelger]

• added i18n option to all hard-coded user-facing strings

[codecov]

Codecov Report

Merging #162 into master will increase coverage by 14.81%.
The diff coverage is 88.93%.

@@              Coverage Diff              @@
##             master     #162       +/-   ##
=============================================
+ Coverage     42.54%   57.36%   +14.81%     
- Complexity        0      462      +462     
=============================================
  Files            96      145       +49     
  Lines          2597     3990     +1393     
  Branches        537      688      +151     
=============================================
+ Hits           1105     2289     +1184     
- Misses         1492     1612      +120     
- Partials          0       89       +89

Flag	Coverage Δ	Complexity Δ
#jest	37.89% <77.77%> (+1.62%)	0 <0> (ø)	⬇️
#karma	93.54% <92.3%> (-0.12%)	0 <0> (ø)
#unittests	82.24% <88.99%> (?)	462 <70> (?)

Impacted Files	Coverage Δ	Complexity Δ
...ls/v1/storeviewexporter/StoreViewExporterImpl.java	100% <ø> (ø)	4 <0> (?)
...al/models/v1/categorylist/CategoriesRetriever.java	100% <ø> (ø)	4 <0> (?)
...onents/models/productcarousel/ProductCarousel.java	0% <0%> (ø)	0 <0> (?)
react-components/src/utils/hooks.js	94.44% <100%> (ø)	0 <0> (ø)	⬇️
...e/core/components/client/MagentoGraphqlClient.java	93.1% <100%> (ø)	9 <0> (?)
...models/v1/productcarousel/ProductCarouselImpl.java	71.73% <50%> (ø)	12 <4> (?)
...nal/models/v1/productteaser/ProductTeaserImpl.java	58% <66.66%> (ø)	16 <2> (?)
...components/src/components/Checkout/editableForm.js	43.24% <71.42%> (+40.38%)	0 <0> (ø)	⬇️
...dels/v1/categorylist/FeaturedCategoryListImpl.java	80% <83.33%> (ø)	5 <2> (?)
...models/v1/relatedproducts/RelatedProductsImpl.java	87.5% <87.5%> (ø)	13 <13> (?)
... and 56 more

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[mhaack]

Actually the footer component has many demo texts we might want to clean up later. But that is not related to the PR ;-)