Since the autosuggest uses its own redux store, the following use case is not possible:

renderContactSuggestion(item) {
    return (
        <span className={'suggestion-content'}>
            {item.firstName} {item.lastName} (<I18n message={"contactType."+item.type}/>)
        </span>
    )
}

The I18n Component uses a redux store, where the global translation messages are stored. But when the renderer is called, there is only the store from autosuggest.