Add i18n support

[jambojet-dima]

Is your feature request related to a problem? Please describe.
Currently, the breadcrumbs are not displayed correctly on pages with other (non-primary) languages.

Describe the solution you'd like
To fix this, the breadcrumbs should be updated to use the current language.
This can be done by using the locale property of the astro object.

For example, the following code will display the breadcrumbs in the current language:
<Breadcrumbs locale={Astro.currentLocale} />

[zdlldz]

Hi @felix-berlin, this is an awesome little plugin — many thanks for the efforts.

This might be semi-unrelated but I was running into an issue with my "home" breadcrumb not using the current/relative locale in the url, e.g. index > 0 crumbs do include the correct locale in the url, but the index 0 (home) crumb does not include the locale (and would therefore 404).

If anyone else is running into this, here's how I solved it:

const customizeBreadcrumbLinks = [
  { index: 0, "href": `/${Astro.currentLocale}/` },
];

Then:

<Breadcrumbs customizeLinks={customizeBreadcrumbLinks}>

Just wanted to add this here in case it's helpful. Many thanks regardless! 🙏