Received no skill points for translating sentences.
I'm in German right now, in the food section, and no matter how many sentences I translate, or other people's sentences I rate, I don't receive any skill points from them. I'm currently at 117/260 and it hasn't moved a point.
I think I have discovered how the points are counted. Each sentence are related to a section depending on its difficult or words. If you have unlocked the section, you will receive the points to the section. If it is locked or mastered, you will receive only skill points, and no section points. I have noticed that because sometimes when I translate a sentence, I see "+ Skill points" and sometimes I see "+ 7 Food" or "+ 7 People". If you have "117/260" and have translated a sentence related to another section, it will keep the same points, giving you just skill points.