I found the feature but it is not what I want to do. I want to put my translation in my language. I am no one to judge if the english is accurate neither if my way of translating can suit other people speaking the same language as me. So I would like to do it the same way as the word one, where I can just use my translation.
I also tried to add the sentence which were already part of my schedule to my schedule with my own translation but only some got caught and they are in red as in : can not be studied een thought it is the same sentence I am currently studying. I just changed the translation to one better suited for me.
Thanks for the info - I will try and add this in the future. While it is possible to add custom definitions to vocabulary and kanji (that stay private to you), it is not yet available for sentences. I will try and add this in the future!