Jonas Jenwald 1f9533bae9 Re-factor the L10n-implementations to use lowercase language-codes internally
This is consistent with the implementation used in the (now removed) webL10n-library, and by only using lowercase language-codes internally in the `L10n`-implementations we should avoid future issues e.g. when users manually set the `locale`-option (in the default viewer).
2023-11-13 21:06:03 +01:00
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