Praise be to Allaah.
We ask Allaah to reward you for your keenness. In response to your question, the reward mentioned in this hadeeth is only for the one who reads the Quraan as it is in Arabic, not for the one who reads the interpretation of the meanings in any other language. However, if a person reads a translation of the meanings in order to understand the meaning and benefit from what the aayaat are saying, then he will be rewarded for doing this, and his reward is with Allaah, because the Muslim will be rewarded for reading tafseer (explanation and commentary), and a translation is tafseer. But there is no indication that the person who reads a translation will earn the reward mentioned in the hadeeth. The bounty of Allaah is immense. And Allaah knows best.