I can assure you that it's not a translation. There is only one final report released and it's in English. All of the aviation accident reports produced by the NTSC in recent times have been in English, even domestic accidents and incidents.
I can assure you that it's a translation of a draft (not published) written in the native language of the country
Or .. if it's not a translation .. this mean that all the investigators and administrative personnel involved have english as mother language ... and this is practically impossible