alt tag images not correct in theme – Lobo

Hello and thank you in advance for your time!
I have a really bad problem with my alt tags of the images in modular pages – https://goo.gl/IzFXQj it seems that the theme inserts tags of images like alt=”” and thats it, I modified the code to look like this:

$content .= '<img class="image-0" src="' . $module->bgimage . '" alt="' . $module->bgimage . '" />';

now alt tag is my full adress and name of the image, is there a way to get the alt tag of an image from wordpress with the full adress of it? or is there a way around that?

Thank you very much, hope someone can help me, because this is pretty bad SEO for a page designed with only images on mind and no, or little written word. Thanks again and have a nice day!!