That is not for web browsers to decide. If the creator of the website/page intends a wider multilingual audience, nothing stops them from providing translations

That is not for web browsers to decide. If the creator of the website/page intends a wider multilingual audience, nothing stops them from providing translations of the same content into different languages. In this day and age when we have access to multilingual online dictionaries, thesauri and even translators like Google Translate, discouraging unfamiliar words sounds extreme.