What version of starlight are you using?

0.21.3

What version of astro are you using?

4.5.14

What package manager are you using?

pnpm

What operating system are you using?

Windows

What browser are you using?

Vivaldi, Firefox

Describe the Bug

I've created i18n\root.json with translations of Expressive Code labels in Russian.
Then, I've updated astro.config.mjs with this text:

export default defineConfig({
  integrations: [
    starlight({
      title: 'My Docs',
      defaultLocale: 'root',
      locales: {
        root: {
          label: 'Русский',
          lang: 'ru',
        },
      },
    }),
  ],
});

But it does not help - there is no translation for "Copy to clipboard" button.
Then I've added en locale to config:

locales: {
  root: {
    label: 'Русский',
    lang: 'ru',
  },
  en: {
    label: 'English',
    lang: 'en',
  },
},

And now I have a translation of "Copy to clipboard" text in Russian. But I do not want to have language switcher in the navbar. I want to have only Russian locale on my site. Is this a bug or a feature? :)

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-tqaa8v?file=astro.config.mjs

Participation

• I am willing to submit a pull request for this issue.