A way to fix the texture UV easly Is there any way to fix the UV without moving the UV vertices ? (This mesh has got a lot of vertices and it would be a lot of time to make them correct) 
Maybe a tool like in the image editor softwares (clone tool) for UVs ?
It's available under Texture Paint.


Go to Texture Paint.
Select Clone Brush.





Hit CTRL where you want to take sample from.
Adjust Radius and Strength then paint on the mesh.





When you are done with painting don't forget to go to Slot tab and Save all images.