Add confirmation to flush the whole page cache

(cherry picked from commit ba4f133)

Author: tvdeyen

app/views/alchemy/admin/pages/_toolbar.html.erb

@@ -21,8 +21,8 @@
         <%= button_to(
           render_icon(:eraser),
           alchemy.flush_admin_pages_path,
-          "turbo-method": :post,
-          class: "icon_button please_wait"
+          "data-turbo-confirm": Alchemy.t(:confirm_to_flush_cache),
+          class: "icon_button"
         ) %>
       </sl-tooltip>
     </div>

config/locales/alchemy.en.yml

@@ -399,6 +399,7 @@ en:
     confirm_to_delete_menu: "Do you really want to delete this menu?"
     confirm_to_delete_node: "Do you really want to delete this menu node?"
     confirm_to_delete_page: "Do you really want to delete this page?"
+    confirm_to_flush_cache: "Do you really want to flush the page cache? This will might take a while and can make first page requests slow."
     ingredient_validations_headline: "Please check marked fields below"
     copy: "copy"
     copy_element: "Copy this element"