Localize a string using custom locale

[Gatos]

Hello,

For example I need to localize a string to defferent languages.

How is it possible to localize using a custom locale?

I found that a method in Localizer class, but it's deprecated:
public String getString(final String key, final Component component, final
IModel model, final Locale locale, final String style, final String
defaultValue)


Thank you.