QuickWrite

Already added in the updated description, but here as well:

/give @a oak_sign[block_entity_data={id:sign,front_text:{messages:[[{"text":"Dieser Text","color":"#ff3333"}],[{"text":"macht Boom!!","color":"#ff3333"}],[{atlas:"minecraft:blocks",sprite:"block/fire_0",color:"white"},{atlas:"minecraft:blocks",sprite:"block/tnt_side",color:"white"}],""],has_glowing_text:1}}]

And place the sign down.