How to extract insights from the given data?
The language that are used on review text just happened to be my native language. I can confirm that the review_text at least from what you showed above is a direct translation of the raw text (although I would say the translation is not perfect). 

Maybe you can consider making unsupervised model and probably compare between these two, see how much they match (theoretically since they are the same text they should have many overlaps).