This thread is resolved. Here is a description of the problem and solution.
Problem: The Pictures of Variations of the translated Products are not available Solution: This was caused by the fact that the Variations (product_variation) Post type was set to "Not translatable" and the Media (attachment) was set to "fallback to default language". The correct setting for both is "Translatable - only show translated items"
You can set those options in WPML -> Settings -> Post Types Translation
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