Add addMissingSections() function to inject "Filme ohne Deutsch"/"Movies without German" heading before #missingMovies table and "Serien ohne Deutsch"/"Series without German" before first .missing-series element. Style .missing-section-heading with 9px border-radius, uppercase 12px/800 text, 10px/13px padding, and glowing dot indicator. Apply blue gradient/border for .movies section