Add localization for status and error messages

Replaced hardcoded status and error messages with localized strings throughout the downloader, main GUI, update dialog, and video info components. Updated English and Spanish language files with new keys for download statuses, errors, playlist info, and UI labels to improve internationalization and maintainability.

src/gui/ytsage_gui_dialogs/ytsage_dialogs_update.py

@@ -18,6 +18,10 @@ from PySide6.QtWidgets import QDialog, QHBoxLayout, QLabel, QProgressBar, QPushB
 from src.core.ytsage_utils import get_ytdlp_version, load_config, save_config
 from src.core.ytsage_yt_dlp import get_yt_dlp_path
 from src.utils.ytsage_constants import OS_NAME, SUBPROCESS_CREATIONFLAGS, YTDLP_APP_BIN_PATH, YTDLP_DOWNLOAD_URL
+from src.utils.ytsage_localization import LocalizationManager
+
+# Shorthand for localization
+_ = LocalizationManager.get_text
 from src.utils.ytsage_localization import _
 from src.utils.ytsage_logger import logger
 
@@ -278,7 +282,7 @@ class UpdateThread(QThread):
                     self.update_status.emit(f"❌ Error during pip update: {e}")
                     return False
             else:
-                self.update_status.emit("✅ yt-dlp is already up to date!")
+                self.update_status.emit(_("update.already_up_to_date"))
                 self.update_progress.emit(95)
                 return True