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Overview of the issue
We recommend translating WordPress sites created with Divi theme using either the Advanced Translation Editor or Classic Translation Editor.
If you need to translate your project manually, please note you cannot do so using the Divi Back-end Builder if you have formatted your URL to use A different domain per language. Instead, you will notice that it works fine on the default language, but it gets stuck in an infinite loop for secondary languages.
As Divi uses an iframe for the frontend editor, it is something we cannot fix in our side. In the meantime, please edit your translations with Divi Visual Builder as a workaround.