# Localization

Localization filters enable you to customize the language and format of elements according to the customer’s locale.

## t

`string | t`

returns  [string](../basics/liquid-types#string)

Returns a string of translated text for a given translation key from a [locale file](/docs/theme/architecture/locales/overview).

**tip**

To learn more about using the `t` filter, refer to [Storefront locale file usage](/docs/theme/architecture/locales/storefront-locale-files#usage).

The translation key must be prefixed with `i18n.`, followed by the key's path in the locale file.

**Code**

```liquid
{{ 'i18n.products.product.sold_out' | t }}
```

Pass named arguments to interpolate variables into the translated string:

**Code**

```liquid
{{ 'i18n.products.product.save' | t: amount: 18.88 }}
```

**warning**

Count-based plural forms (such as `one`/`other` value objects) aren't supported. Use a flat string for each key, and handle pluralization in Liquid if you need it.