This thread is resolved. Here is a description of the problem and solution.
Problem:
You need to translate elements like headers and footers created with GeneratePress and Blocks.
Solution:
We recommend following our detailed guide on how to translate these elements using WPML. You can find the guide here: Translating GeneratePress Theme Using WPML.
If this solution does not apply to your case, or if it seems outdated, please check the related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. We highly recommend opening a new support ticket if you need further assistance. You can do so at WPML support forum.
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This topic is split from https://wpml.org/forums/topic/page-not-translated-correctly/