How to set the language of the Frontend?

Development Modding
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Currently, there is no UI to change the language in the frontend. You can manually set the language of any Unreal Engine program by modifying its *Engine.ini file. Add/find the Internationalization section, add/find the Culture key, set the value to the ISO 639 code of your desired language. You can find this file at /Engine/Programs/UnrealFrontend/Config/DefaultEngine.ini.

Examples

DefaultEngine.ini for English

[Internationalization]
Culture=en

DefaultEngine.ini for Japanese

[Internationalization]
Culture=ja