Hi
For related course issue use this css code as per you need
.single-course .block.courseitem.course3 .block_content{
height:100px !important;
}
.single-course .block.courseitem.course3 .block_media img {
height:300px !important;
}
this is not possible to hide reviews if there is no review
For this you can translate these strings using any translation plugin like loco translate.