"Normal scale" replaces "A4 scale" in the Page menu

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

client/index.html

@@ -78,13 +78,13 @@
     <div class="toolbar_right">
     <div class="group" id="host_tools">
       <button id="page_menu_button" type="button" aria-haspopup="menu" aria-expanded="false"
-              data-help="The page and the view: fit the page to the window, show it at A4 scale, make it larger or smaller, and whether it grows as you write.">Page</button>
+              data-help="The page and the view: fit the page to the window, show it at its normal scale, make it larger or smaller, and whether it grows as you write.">Page</button>
       <div id="page_menu" class="popup menu" role="menu" hidden>
         <div class="menu_title">Change the display of the page</div>
         <button id="zoom_fit" type="button" class="menu_item" role="menuitem"
                 data-help="Show the whole page in the window. Pressed by the host, it does so on every screen. Ctrl (Command on a Mac) with the scroll wheel, or with a pen stroke up or down, zooms about the pointer.">Fit to the window</button>
         <button id="zoom_sheet" type="button" class="menu_item" role="menuitem"
-                data-help="Show the page at the scale a new page has: a full A4 page filling the window. A shrunk page is then seen at its own size rather than enlarged. Pressed by the host, it does so on every screen.">A4 scale</button>
+                data-help="Show the page at the scale a new page has, one full page filling the window. A shrunk page is then seen at its own size rather than enlarged. Pressed by the host, it does so on every screen.">Normal scale</button>
         <hr>
         <div class="menu_title">Change the size of the page</div>
         <button id="zoom_expand" type="button" class="menu_item" role="menuitem" hidden