Hi Tantine,
Yes it's a little problem of the polls for evaluations. If you wish to justify, you have to go to the page of the translation and post a comment. I would like to make available to post a comment directly from the poll area in the future. Still to be done.
For your own translations, in my opinion, you can vote for them. If you vote "yes it's good meaning", it means you have checked again your ttranslation and you've decided that, it's definitely good

.