Instance of class Streami18n should be provided to the Chat component to handle translations. Stream provides the following list of built-in translations for components:

1. English (en)
2. Dutch (nl)
3. Russian (ru)
4. Turkish (tr)
5. French (fr)
6. Italian (it)
7. Hindi (hi)

The default language is English. The simplest way to start using chat components in one of the in-built languages is the following:

Simplest way to start using chat components in one of the in-built languages would be following:

const i18n = new Streami18n({ language: 'nl' });
<Chat client={chatClient} i18nInstance={i18n}>
  ...
</Chat>;

If you would like to override certain keys in in-built translation:

const i18n = new Streami18n({
  language: 'nl',
  translationsForLanguage: {
    'Nothing yet...': 'Nog Niet ...',
    '{{ firstUser }} and {{ secondUser }} are typing...':
      '{{ firstUser }} en {{ secondUser }} zijn aan het typen...',
  },
});

You can find all the available keys here: https://github.com/GetStream/stream-chat-react-native/tree/master/src/i18n

They are also exported as a JSON object from the library.

import {
  enTranslations,
  nlTranslations,
  ruTranslations,
  trTranslations,
  frTranslations,
  hiTranslations,
  itTranslations,
  esTranslations,
} from 'stream-chat-react-native'; // or 'stream-chat-expo'

Please read this docs on i18n for more details and further customizations - https://getstream.github.io/stream-chat-react-native/#streami18n