Align Language model with one from Deisgn system

[nobilo]

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LanguagesOfSwitzerland

Summary

We have https://github.com/baloise/web-app-utils/blob/master/packages/utils/src/language/language-model.ts and we have specific types for languages in design system:

https://github.com/baloise/design-system/blob/669c63fd734137e886fc50dc0075631e8b0acc07/packages/components/src/utils/config/config.types.ts
I guess this lib should adapt to use the ones from DS instead of strings.
What do you guys think?

Justification

Otherwise we need to remap types:
initialize({
region: 'CH',
language: LanguagesOfSwitzerland.valueOfOrDefault(
getBrowserLang() ?? GERMAN.key,
).key as BalSwissLanguage,
allowedLanguages: LanguagesOfSwitzerland.all.map(
(lan) => lan.key as BalSwissLanguage,
),
});