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Chart <a:t> elements (title, axis labels, series names) were collected and sent to the LLM, but the apply loop never invoked their setters. Reason: the apply loop iterated only text_elements[:sheet_name_offset], which excluded the chart-text positions (sheet names were inserted in the middle, pushing chart texts past sheet_name_offset). The LLM correctly returned French for "Revenue by Product" / "Quantity Trend" / "Order #" but the result was thrown away. Fix: include the chart-text slice [sheet_name_offset + N .. total_texts] in the apply loop. Setters for sheet names are still None, so they are naturally skipped. Add test_excel_chart_text_applied.py (2 end-to-end tests) using a fixed provider that pre-translates every known chart text; the test asserts all chart <a:t> values in the output .xlsx come from the FR table, not the original English source.