diff --git a/lib/l10n/arb/app_en.arb b/lib/l10n/arb/app_en.arb
index 0972cd49..8b318881 100644
--- a/lib/l10n/arb/app_en.arb
+++ b/lib/l10n/arb/app_en.arb
@@ -9,8 +9,10 @@
 
   "navHome": "Home",
   "@navHome": {"description": "Bottom navigation - Home tab"},
+  "navLibrary": "Library",
+  "@navLibrary": {"description": "Bottom navigation - Library tab"},
   "navHistory": "History",
-  "@navHistory": {"description": "Bottom navigation - History tab"},
+  "@navHistory": {"description": "Bottom navigation - History tab (legacy)"},
   "navSettings": "Settings",
   "@navSettings": {"description": "Bottom navigation - Settings tab"},
   "navStore": "Store",
@@ -670,6 +672,13 @@
       "trackName": {"type": "String"}
     }
   },
+  "snackbarAlreadyInLibrary": "\"{trackName}\" already exists in your library",
+  "@snackbarAlreadyInLibrary": {
+    "description": "Snackbar - track already exists in local library",
+    "placeholders": {
+      "trackName": {"type": "String"}
+    }
+  },
   "snackbarHistoryCleared": "History cleared",
   "@snackbarHistoryCleared": {"description": "Snackbar - history deleted"},
   "snackbarCredentialsSaved": "Credentials saved",
@@ -1476,6 +1485,16 @@
   "@settingsAutoExportFailed": {"description": "Setting toggle for auto-export"},
   "settingsAutoExportFailedSubtitle": "Save failed downloads to TXT file automatically",
   "@settingsAutoExportFailedSubtitle": {"description": "Subtitle for auto-export setting"},
+
+  "settingsDownloadNetwork": "Download Network",
+  "@settingsDownloadNetwork": {"description": "Setting for network type preference"},
+  "settingsDownloadNetworkAny": "WiFi + Mobile Data",
+  "@settingsDownloadNetworkAny": {"description": "Network option - use any connection"},
+  "settingsDownloadNetworkWifiOnly": "WiFi Only",
+  "@settingsDownloadNetworkWifiOnly": {"description": "Network option - only use WiFi"},
+  "settingsDownloadNetworkSubtitle": "Choose which network to use for downloads. When set to WiFi Only, downloads will pause on mobile data.",
+  "@settingsDownloadNetworkSubtitle": {"description": "Subtitle explaining network preference"},
+
   "queueEmpty": "No downloads in queue",
   "@queueEmpty": {"description": "Empty queue state title"},
   "queueEmptySubtitle": "Add tracks from the home screen",
@@ -1675,5 +1694,158 @@
   "allFilesAccessDeniedMessage": "Permission was denied. Please enable 'All files access' manually in system settings.",
   "@allFilesAccessDeniedMessage": {"description": "Message when permission is permanently denied"},
   "allFilesAccessDisabledMessage": "All Files Access disabled. The app will use limited storage access.",
-  "@allFilesAccessDisabledMessage": {"description": "Snackbar message when user disables all files access"}
+  "@allFilesAccessDisabledMessage": {"description": "Snackbar message when user disables all files access"},
+
+  "settingsLocalLibrary": "Local Library",
+  "@settingsLocalLibrary": {"description": "Settings menu item - local library"},
+  "settingsLocalLibrarySubtitle": "Scan music & detect duplicates",
+  "@settingsLocalLibrarySubtitle": {"description": "Subtitle for local library settings"},
+  "libraryTitle": "Local Library",
+  "@libraryTitle": {"description": "Library settings page title"},
+  "libraryStatus": "Library Status",
+  "@libraryStatus": {"description": "Section header for library status"},
+  "libraryScanSettings": "Scan Settings",
+  "@libraryScanSettings": {"description": "Section header for scan settings"},
+  "libraryEnableLocalLibrary": "Enable Local Library",
+  "@libraryEnableLocalLibrary": {"description": "Toggle to enable library scanning"},
+  "libraryEnableLocalLibrarySubtitle": "Scan and track your existing music",
+  "@libraryEnableLocalLibrarySubtitle": {"description": "Subtitle for enable toggle"},
+  "libraryFolder": "Library Folder",
+  "@libraryFolder": {"description": "Folder selection setting"},
+  "libraryFolderHint": "Tap to select folder",
+  "@libraryFolderHint": {"description": "Placeholder when no folder selected"},
+  "libraryShowDuplicateIndicator": "Show Duplicate Indicator",
+  "@libraryShowDuplicateIndicator": {"description": "Toggle for duplicate indicator in search"},
+  "libraryShowDuplicateIndicatorSubtitle": "Show when searching for existing tracks",
+  "@libraryShowDuplicateIndicatorSubtitle": {"description": "Subtitle for duplicate indicator toggle"},
+  "libraryActions": "Actions",
+  "@libraryActions": {"description": "Section header for library actions"},
+  "libraryScan": "Scan Library",
+  "@libraryScan": {"description": "Button to start library scan"},
+  "libraryScanSubtitle": "Scan for audio files",
+  "@libraryScanSubtitle": {"description": "Subtitle for scan button"},
+  "libraryScanSelectFolderFirst": "Select a folder first",
+  "@libraryScanSelectFolderFirst": {"description": "Message when trying to scan without folder"},
+  "libraryCleanupMissingFiles": "Cleanup Missing Files",
+  "@libraryCleanupMissingFiles": {"description": "Button to remove entries for missing files"},
+  "libraryCleanupMissingFilesSubtitle": "Remove entries for files that no longer exist",
+  "@libraryCleanupMissingFilesSubtitle": {"description": "Subtitle for cleanup button"},
+  "libraryClear": "Clear Library",
+  "@libraryClear": {"description": "Button to clear all library entries"},
+  "libraryClearSubtitle": "Remove all scanned tracks",
+  "@libraryClearSubtitle": {"description": "Subtitle for clear button"},
+  "libraryClearConfirmTitle": "Clear Library",
+  "@libraryClearConfirmTitle": {"description": "Dialog title for clear confirmation"},
+  "libraryClearConfirmMessage": "This will remove all scanned tracks from your library. Your actual music files will not be deleted.",
+  "@libraryClearConfirmMessage": {"description": "Dialog message for clear confirmation"},
+  "libraryAbout": "About Local Library",
+  "@libraryAbout": {"description": "Section header for about info"},
+  "libraryAboutDescription": "Scans your existing music collection to detect duplicates when downloading. Supports FLAC, M4A, MP3, Opus, and OGG formats. Metadata is read from file tags when available.",
+  "@libraryAboutDescription": {"description": "Description of local library feature"},
+  "libraryTracksCount": "{count} tracks",
+  "@libraryTracksCount": {
+    "description": "Track count in library",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "libraryLastScanned": "Last scanned: {time}",
+  "@libraryLastScanned": {
+    "description": "Last scan time display",
+    "placeholders": {
+      "time": {"type": "String"}
+    }
+  },
+  "libraryLastScannedNever": "Never",
+  "@libraryLastScannedNever": {"description": "Shown when library has never been scanned"},
+  "libraryScanning": "Scanning...",
+  "@libraryScanning": {"description": "Status during scan"},
+  "libraryScanProgress": "{progress}% of {total} files",
+  "@libraryScanProgress": {
+    "description": "Scan progress display",
+    "placeholders": {
+      "progress": {"type": "String"},
+      "total": {"type": "int"}
+    }
+  },
+  "libraryInLibrary": "In Library",
+  "@libraryInLibrary": {"description": "Badge shown on tracks that exist in local library"},
+  "libraryRemovedMissingFiles": "Removed {count} missing files from library",
+  "@libraryRemovedMissingFiles": {
+    "description": "Snackbar after cleanup",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "libraryCleared": "Library cleared",
+  "@libraryCleared": {"description": "Snackbar after clearing library"},
+  "libraryStorageAccessRequired": "Storage Access Required",
+  "@libraryStorageAccessRequired": {"description": "Dialog title for storage permission"},
+  "libraryStorageAccessMessage": "SpotiFLAC needs storage access to scan your music library. Please grant permission in settings.",
+  "@libraryStorageAccessMessage": {"description": "Dialog message for storage permission"},
+  "libraryFolderNotExist": "Selected folder does not exist",
+  "@libraryFolderNotExist": {"description": "Error when folder doesn't exist"},
+  "librarySourceDownloaded": "Downloaded",
+  "@librarySourceDownloaded": {"description": "Badge for tracks downloaded via SpotiFLAC"},
+  "librarySourceLocal": "Local",
+  "@librarySourceLocal": {"description": "Badge for tracks from local library scan"},
+  "libraryFilterAll": "All",
+  "@libraryFilterAll": {"description": "Filter chip - show all library items"},
+  "libraryFilterDownloaded": "Downloaded",
+  "@libraryFilterDownloaded": {"description": "Filter chip - show only downloaded items"},
+  "libraryFilterLocal": "Local",
+  "@libraryFilterLocal": {"description": "Filter chip - show only local library items"},
+
+  "libraryFilterTitle": "Filters",
+  "@libraryFilterTitle": {"description": "Filter bottom sheet title"},
+  "libraryFilterReset": "Reset",
+  "@libraryFilterReset": {"description": "Reset all filters button"},
+  "libraryFilterApply": "Apply",
+  "@libraryFilterApply": {"description": "Apply filters button"},
+  "libraryFilterSource": "Source",
+  "@libraryFilterSource": {"description": "Filter section - source type"},
+  "libraryFilterQuality": "Quality",
+  "@libraryFilterQuality": {"description": "Filter section - audio quality"},
+  "libraryFilterQualityHiRes": "Hi-Res (24bit)",
+  "@libraryFilterQualityHiRes": {"description": "Filter option - high resolution audio"},
+  "libraryFilterQualityCD": "CD (16bit)",
+  "@libraryFilterQualityCD": {"description": "Filter option - CD quality audio"},
+  "libraryFilterQualityLossy": "Lossy",
+  "@libraryFilterQualityLossy": {"description": "Filter option - lossy compressed audio"},
+  "libraryFilterFormat": "Format",
+  "@libraryFilterFormat": {"description": "Filter section - file format"},
+  "libraryFilterDate": "Date Added",
+  "@libraryFilterDate": {"description": "Filter section - date range"},
+  "libraryFilterDateToday": "Today",
+  "@libraryFilterDateToday": {"description": "Filter option - today only"},
+  "libraryFilterDateWeek": "This Week",
+  "@libraryFilterDateWeek": {"description": "Filter option - this week"},
+  "libraryFilterDateMonth": "This Month",
+  "@libraryFilterDateMonth": {"description": "Filter option - this month"},
+  "libraryFilterDateYear": "This Year",
+  "@libraryFilterDateYear": {"description": "Filter option - this year"},
+  "libraryFilterActive": "{count} filter(s) active",
+  "@libraryFilterActive": {
+    "description": "Badge showing number of active filters",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+
+  "timeJustNow": "Just now",
+  "@timeJustNow": {"description": "Relative time - less than a minute ago"},
+  "timeMinutesAgo": "{count, plural, =1{1 minute ago} other{{count} minutes ago}}",
+  "@timeMinutesAgo": {
+    "description": "Relative time - minutes ago",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "timeHoursAgo": "{count, plural, =1{1 hour ago} other{{count} hours ago}}",
+  "@timeHoursAgo": {
+    "description": "Relative time - hours ago",
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  }
 }