Add localization framework for the GUI (en-US baseline) (#764)

Credit to @jmolinap2 for their work in #643, which was used as inspiration.

Tests/TestData/LanguageLoading/en-US/Features.json

@@ -0,0 +1,20 @@
+{
+  "Features": {
+    "DisableTelemetry": {
+      "Label": "Disable telemetry",
+      "ToolTip": "Disables telemetry collection."
+    },
+    "ClearStart": {
+      "Label": "Remove for the selected user"
+    }
+  },
+  "UiGroups": {
+    "SearchIcon": {
+      "Label": "Taskbar search style"
+    },
+    "ClearStart": {
+      "Label": "Remove pinned apps from the start menu",
+      "ToolTip": "This setting allows you to quickly remove all pinned apps from the start menu."
+    }
+  }
+}