Is it permissible to establish a translation company for all languages except Hebrew, while avoiding the translation of unlawful content, and dealing with foreign translators and companies for a fee?

It is permissible to translate permissible materials from one language to another and to take payment for it, as long as the benefit is permissible and known, and the payment is known. This is a form of permissible lease (ijarah) in Islamic law. There is no objection to dealing with non-Muslims in this regard, as the Messenger of Allah, peace and blessings be upon him, and the Companions and Muslims dealt with disbelievers in buying, selling, and leasing.