In notification it says, "user x has accepted collaboration request on your project y" but it should be "user x has accepted your collaboration request on the project y, or regarding project y", since we don't know whose project it is but we know whose collaboration request it is.
In notification it says, "user x has accepted collaboration request on your project y" but it should be "user x has accepted your collaboration request on the project y, or regarding project y", since we don't know whose project it is but we know whose collaboration request it is.