Honestly, I see very few foreign characters in that PDF. I see incorrect characters with really weird spacing - to the point where I can only see about half or 1/3 of the width of a lot of the characters ... but they mostly all look like standard "Western European" characters.
Of course, Opera 19 is an unstable build (Opera Next), but as Pesala can reproduce in the current stable version we'll leave the post in this forum.