I installed the Gtranslate module in Drupal 8, and I added its block in the right region.

The default language is English. When I change it to French, all the text is changed to French. When I refresh the page, the text is still show in French, but the default value is changed to English.

I debugged the module and found that $_SERVER['HTTP_X_GT_LANG'] is always undefined.

Does anyone know how to fix this issue?

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