ok I saw that you often release new versions, please let me know when captions are supported, it is very important for my client.

Sure we will let you know when it is supported in theme.

 

in addiction, I see image title, but I do not understand the text in second row, it is the one I thought it was wrong, see attached image

It is displayed by Unyson plugin. You can hide it by adding the following CSS code in the Custom CSS code option of your theme on the below path.

Admin Area -> Appearance -> Theme Settings -> Custom Code -> CSS Code

#lightcase-case #lightcase-caption {
    display: none !important;
}