feat(embed): add locale

docs/embed/introduction.mdx

@@ -44,6 +44,10 @@ However, if you want to have a better understanding, you can customize the appea
 
 #### Customizing
 
+- `locale`: The language of the form. Default is `pt-BR`. Available languages are:
+  - `pt`
+  - `en`
+  - `es`
 - `call_to_action`: The text displayed on the submit button. Default is _"Inscrever"_.
 - `thanks_message`: The message displayed to the user after submitting the form. Default is _"Inscrição realizada com sucesso! Em breve você receberá novidades por email."_. If you want to redirect the user after submitting the form, you can use the `redirect_url` attribute instead.
 - `redirect_url`: The URL to redirect the user after submitting the form. _Optional_.
@@ -97,7 +101,6 @@ The available attributes are:
 - `custom_field_<index>_required`: Whether the custom field is required. Default is `false`.
 - `custom_field_<index>_placeholder`: The placeholder text of the custom field. _Optional_.
 
-
 ---
 
 ## Support