Jobs!
You could try the paper lesson - it's pretty well known. Print out a piece of paper with a blank face on it.For prep: Tape the paper to the desk FACE DOWN - so that the student's CAN'T see that there's a face on it. Tell the students to write an insult on the paper, then crumple it up, stomp on it, etc. Then tell them to take the paper and smooth it out, and to apologize to the paper and say they were sorry. Then tell them to look at the paper and see how nothing has really changed, and the damage to the paper is still there. Have them look at the blank face on the other side of the paper and help them make the connection between their actions and the effect they can have on other people ; how you can apologize and smooth things over but the memories and damage are still there. I did that lesson my sophomore year of high school and it really stuck with me.
It might not be age appropriate, but I was asked to give an ethics lesson to some high-level elementary students. You could probably cut off the bit after the three examples I give (also that's my face in those slides!). This is an ethics lesson that adresses 7 points of ethics (Honesty, compassion, responsibility, etc.) and gives one simple rule: Don't treat people like things. It has been translated into Korean by one of my co-teachers. I think that it's hard to address behavior when we can't name it, so this might help with that particular language barrier. Good luck!