Fix remaining German labels in drawings 731, 847 and 471

- 731 (atmosphere layers): axis label "Höhe" -> "Höjd"
- 847, 471 (spectrum): "Terahertzstrahlung" -> "Terahertzstrålning"
- 847 alt-text now quotes the Swedish labels shown in the picture
- SVGs regenerated

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

contents/drawings/471.svg

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