- Add ROW_LABEL_MAP (DE→EN) covering GuV, Liquidität, Kunden, Betriebliche Aufwendungen rows
- Add FORMULA_TOOLTIPS_EN with English tooltip text for all formula-driven rows
- Add MONTH_LABELS_EN (Mrz→Mar, Mai→May, Okt→Oct)
- LabelWithTooltip now accepts `de` flag, translates display text and tooltip accordingly
- Month column headers switch between DE/EN month abbreviations
- Falls back to original German label for any row not in the map
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>