[openstreetmap/openstreetmap-website] Update to i18n-js 4.x (PR #5811)

[Tom Hughes]

@tomhughes commented on this pull request.



>  
   // '-' are replaced with '_' in https://github.com/eemeli/make-plural/tree/main/packages/plurals
   const pluralizer = plurals[locale.replace(/\W+/g, "_")] || plurals[locale.split("-")[0]];
   if (pluralizer) {
-    I18n.pluralization[locale] = (count) => [pluralizer(count), "other"];
+    OSM.i18n.pluralization.register(locale, I18n.useMakePlural({ pluralizer: locale }));

The actual example upstream is:

```js
register("ru", useMakePlural({ pluralizer: ru })
```

which I misread as I didn't notice the difference between the constant string `ru` and the variable `ru` so I'll fix that now.

I had been struggling to understand your fallback simply because upstream doesn't seem to document the return value of the pluralizer so while I thought it was some sort of fallback but I've found the code in the source now and understand it so I'll fix that as well.

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