Add Chinese localization and update language support

Added a new Simplified Chinese translation file (zh.json) and updated all language files to include Chinese as a selectable language. Updated format quality color logic in the format table to recognize Chinese quality terms, ensuring proper color coding for quality labels in the UI. Also updated the localization manager to include Chinese in the language selection.

src/gui/ytsage_gui_format_table.py

@@ -264,14 +264,14 @@ class FormatTableMixin:
             # Column 1: Quality (Always shown)
             quality_text = self.get_quality_label(f)
             quality_item = QTableWidgetItem(quality_text)
-            # Set color based on quality (check English, Spanish, Portuguese, and Russian terms)
-            if any(term in quality_text for term in ["Best", "Óptima", "Mejor", "Melhor", "Лучшее"]):
+            # Set color based on quality (check English, Spanish, Portuguese, Russian, and Chinese terms)
+            if any(term in quality_text for term in ["Best", "Óptima", "Mejor", "Melhor", "Лучшее", "最佳"]):
                 quality_item.setForeground(QColor("#00ff00"))  # Green for best quality
-            elif any(term in quality_text for term in ["High", "Alta", "Alto", "Áudio Alto", "Audio Alto", "Высокое"]):
+            elif any(term in quality_text for term in ["High", "Alta", "Alto", "Áudio Alto", "Audio Alto", "Высокое", "高清", "高质量"]):
                 quality_item.setForeground(QColor("#00cc00"))  # Light green for high quality
-            elif any(term in quality_text for term in ["Medium", "Media", "Medio", "Média", "Áudio Médio", "Audio Medio", "Среднее"]):
+            elif any(term in quality_text for term in ["Medium", "Media", "Medio", "Média", "Áudio Médio", "Audio Medio", "Среднее", "中等"]):
                 quality_item.setForeground(QColor("#ffaa00"))  # Orange for medium quality
-            elif any(term in quality_text for term in ["Low", "Baja", "Bajo", "Baixa", "Áudio Baixo", "Audio Bajo", "Низкое"]):
+            elif any(term in quality_text for term in ["Low", "Baja", "Bajo", "Baixa", "Áudio Baixo", "Audio Bajo", "Низкое", "低质量"]):
                 quality_item.setForeground(QColor("#ff5555"))  # Red for low quality
             self.format_table.setItem(row, 1, quality_item)
 

src/utils/ytsage_localization.py

@@ -83,7 +83,8 @@ class LocalizationManager:
             "english": "English",
             "spanish": "Español (Spanish)",
             "portuguese": "Português (Portuguese)",
-            "russian": "Русский (Russian)"
+            "russian": "Русский (Russian)",
+            "chinese": "中文 (简体) (Chinese Simplified)"
         },
         "download": {
             "preparing": "🚀 Preparing your download...",