Add missing Header strings from en-us

The locale en-us MUST be the master, not en-gb.

src/strings/en-us.json

@@ -300,6 +300,7 @@
     "HeaderAppearsOn": "Appears On",
     "HeaderAudioBooks": "Audio Books",
     "HeaderAudioSettings": "Audio Settings",
+    "HeaderAutoDiscovery": "Network Discovery",
     "HeaderBlockItemsWithNoRating": "Block items with no or unrecognized rating information:",
     "HeaderBranding": "Branding",
     "HeaderCancelRecording": "Cancel Recording",
@@ -321,6 +322,7 @@
     "HeaderContinueWatching": "Continue Watching",
     "HeaderCustomDlnaProfiles": "Custom Profiles",
     "HeaderDateIssued": "Date Issued",
+    "HeaderDebugging": "Debugging and Tracing",
     "HeaderDefaultRecordingSettings": "Default Recording Settings",
     "HeaderDeleteDevice": "Delete Device",
     "HeaderDeleteDevices": "Delete All Devices",
@@ -382,6 +384,7 @@
     "HeaderMyMedia": "My Media",
     "HeaderMyMediaSmall": "My Media (small)",
     "HeaderNavigation": "Navigation",
+    "HeaderNetworking": "IP Protocols",
     "HeaderNewApiKey": "New API Key",
     "HeaderNewDevices": "New Devices",
     "HeaderNewRepository": "New Repository",
@@ -401,6 +404,7 @@
     "HeaderPlayOn": "Play On",
     "HeaderPleaseSignIn": "Please sign in",
     "HeaderPluginInstallation": "Plugin Installation",
+    "HeaderPortRanges": "Firewall and Proxy Settings",
     "HeaderPreferredMetadataLanguage": "Preferred Metadata Language",
     "HeaderProfileInformation": "Profile Information",
     "HeaderProfileServerSettingsHelp": "These values control how the server will present itself to clients.",
@@ -1533,4 +1537,4 @@
     "YoutubePlaybackError": "Requested video cannot be played.",
     "YoutubeNotFound": "Video not found.",
     "YoutubeDenied": "Requested video is not allowed to be played in embedded players."
-}
+}