---
title: Localize the editor
description: Connect built-in labels and custom actions to the workspace internationalization runtime.
order: 21
toc:
  - id: add-the-catalog
    title: Add the catalog
  - id: fallback
    title: Fallback
  - id: custom-labels
    title: Custom labels
---

## Add the catalog {#add-the-catalog}

```json
{
  "catalogSources": ["@workspace/lexical/locales/{locale}"]
}
```

The package ships American English (`en-US`) and Simplified Chinese (`zh-Hans`) editor catalogs.

## Fallback {#fallback}

Built-in controls follow the active `@workspace/i18n` provider. Outside a provider, they fall back to English so the editor remains usable in isolated previews and tests.

## Custom labels {#custom-labels}

An external action label can be a plain string or a message descriptor containing `id` and `message`. Descriptors participate in the same extraction workflow as application copy.