🌐 Add German translation for `docs/de/docs/tutorial/first-steps.md` (#9530)
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
Co-authored-by: Georg Wicke-Arndt <g.wicke-arndt@outlook.com>
