Move in 3D space in Godot using translation

ForZon.gd

extends Spatial

var speed = 100

func _physics_process(delta):
    if Input.is_action_pressed("ui_space"):
        translation += speed * (Vector3.RIGHT.rotated(Vector3(0, 1, 0), rotation.y)) * delta

func _input(event: InputEvent) -> void:
    if event is InputEventMouseMotion:
        var mouse_pos = get_viewport().get_mouse_position()
        rotation.y = -(mouse_pos - $Camera.unproject_position(translation)).normalized().angle()

Thank you.

I learned RIGHT can be replaced with FORWARD BACK UP DOWN and LEFT thank you thank you. Strangely BACK makes the thing go forward.