You can either use CSS to try and hide them or you can make a copy of the default template folder then delete any files in your copy that you don't intend to change then select it as your template within CB Gallery as this will allow you to customize it however you like. See the below for default template file location.
/components/com_comprofiler/plugin/user/plug_cbgallery/templates/default
You can try the below CSS as I assume you only want to hide the timeago usages.
Code:
.cbGallery .cbDateTimeago,
.galleryModal .cbDateTimeago {
display: none !important;
}