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?