He translates the meanings of the words of the prayer and adhkaar to himself after saying them in Arabic
Question

                Please could you tell me if what I am doing is permissible or not? Arabic is not my mother tongue, and sometimes when I pray, after I say something, I repeat it in English in my mind so as to increase my focus (khushoo‘) and to focus more in my prayer. Hence for example after I say “Sami‘a Allahu liman hamidah” in Arabic, I repeat it in my mind in English (“Allah hears those who praise Him”). Is this permissible or not?.
Praise be to Allah.
      There is nothing wrong with what you are doing to focus on 
      the meanings of the words and adhkaar of the prayer in English after 
      saying them in Arabic. This comes under the heading of pondering the 
      meaning and keeping it in mind. That is so long as you do not utter it; 
      rather you say it to yourself in your mind, because the one who is praying 
      is not allowed to say these words in anything but Arabic if he is able to 
      say them in Arabic. This has been discussed previously in the answer to 
      question no. 3471. 

    And Allaah knows best.