This thread is resolved. Here is a description of the problem and solution.
Problem: We need to show the reviews independent of the language - show the reviews from any language all together.
Solution: It is not possible to make product reviews show in all languages. It is only possible to synchronise comments on duplicate content but not to display the reviews across all the languages.
This is the technical support forum for WPML - the multilingual WordPress plugin.
Everyone can read, but only WPML clients can post here. WPML team is replying on the forum 6 days per week, 22 hours per day.