Function resolveLanguagePreference

Resolve the current website language.

Resolution checks the fixed lang URL query, the supplied local-storage key, navigator.language, and finally the fixed en fallback. Each value is trimmed, treats _ as -, and is canonicalized as a language tag. navigator.languages is intentionally ignored.

The label is generated at runtime with Intl.DisplayNames in the resolved language when available. Runtime wording may vary; the canonical language value is used as the label when display-name generation is unavailable.

Usage:

import {
  resolveLanguagePreference,
  setLanguagePreference,
} from "mazey";

const language =
  resolveLanguagePreference(
    "MY_WEBSITE_LANGUAGE"
  );

console.log(language);

setLanguagePreference(
  "MY_WEBSITE_LANGUAGE",
  "ja-JP"
);
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Possible output:

{
  value: "ja-JP",
  label: "日本語（日本）"
}
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