This plugin allows you to translate any text in Unreal Engine with Deepl AI requests. Use this video as a reference how you can use it.

You will need only a free API Key from Deepl. It allows you to generate up to 500 000 characters in this plan. Deepl has other plans that you can check here.

For this plugin you need only to add your key to the project settings in Runtime Text Translation sections (second image).

You can download free sample project here.