Updated translation on tooltip for code sample (#250)

* Focus is working properly for demo pages

* Updated translation

* Updated flutter/flutter

* Removed ios changes

* Empty commit

gallery/gallery/lib/l10n/intl_en_US.arb

@@ -398,9 +398,9 @@
   "@demoInfoTooltip": {
     "description": "Tooltip for info button in a demo."
   },
-  "demoCodeTooltip": "Code Sample",
+  "demoCodeTooltip": "Demo Code",
   "@demoCodeTooltip": {
-    "description": "Tooltip for code sample button in a demo."
+    "description": "Tooltip for demo code button in a demo."
   },
   "demoDocumentationTooltip": "API Documentation",
   "@demoDocumentationTooltip": {

gallery/gallery/lib/l10n/intl_en_US.xml

@@ -363,8 +363,8 @@
     >Info</string>
   <string
     name="demoCodeTooltip"
-    description="Tooltip for code sample button in a demo."
-    >Code Sample</string>
+    description="Tooltip for demo code button in a demo."
+    >Demo Code</string>
   <string
     name="demoDocumentationTooltip"
     description="Tooltip for API documentation button in a demo."

gallery/gallery/lib/l10n/messages_en_US.dart

@@ -439,7 +439,7 @@ class MessageLookup extends MessageLookupByLibrary {
                 "A Material Design circular progress indicator, which spins to indicate that the application is busy."),
         "demoCircularProgressIndicatorTitle":
             MessageLookupByLibrary.simpleMessage("Circular Progress Indicator"),
-        "demoCodeTooltip": MessageLookupByLibrary.simpleMessage("Code Sample"),
+        "demoCodeTooltip": MessageLookupByLibrary.simpleMessage("Demo Code"),
         "demoCodeViewerCopiedToClipboardMessage":
             MessageLookupByLibrary.simpleMessage("Copied to clipboard."),
         "demoCodeViewerCopyAll":