# Setting: `app_locale_default`

- **Constant:** `ConfigInterface::APP_LOCALE_DEFAULT`
- **Category:** `app`
- **Type:** `select`
- **Required:** yes
- **Sensitive:** no
- **Validation:** `required|string|max:16`
- **Placeholder / default hint:** `en`

## Description

Default panel language for users who have not chosen one (must match an installed translation code, e.g. en, de, fr)

## Allowed options

_Free-form / no fixed options_

## Change via CLI

```bash
featherpanel saas getsetting app_locale_default
featherpanel saas setsetting app_locale_default "<value>"
```

## Change via API

```http
PATCH /api/admin/settings
Content-Type: application/json

{ "app_locale_default": "<value>" }
```