how to implement localization on blocks?

import supportedLanguages from './supportedLanguages'

export default {
  name: 'localeBlockContent',
  type: 'object',
  fieldsets: [
    {
      title: 'Translations',
      name: 'translations',
      options: {collapsible: true}
    }
  ],
  fields: supportedLanguages.map(lang => ({
    title: lang.title,
    name: lang.id,
    type: 'blockContent',
    fieldset: lang.isDefault ? null : 'translations'
  }))
}

import BlockContent from '@sanity/block-content-to-react'
...
<BlockContent blocks={data.sanityPost._rawContent} serializers={serializers} />
...
export const query = graphql`
  query myPostQuery {
    sanityPost(_id: { eq: "myPostId" }) {
      _rawContent
    }
  }
`