remove "Listing" from titles

lib/cannery_web/live/ammo_group_live/index.ex

@@ -30,7 +30,7 @@ defmodule CanneryWeb.AmmoGroupLive.Index do
   end
 
   defp apply_action(socket, :index, _params) do
-    socket |> assign(:page_title, gettext("Listing Ammo groups")) |> assign(:ammo_group, nil)
+    socket |> assign(:page_title, gettext("Ammo groups")) |> assign(:ammo_group, nil)
   end
 
   @impl true

lib/cannery_web/live/ammo_group_live/index.html.heex

@@ -1,6 +1,6 @@
 <div class="mx-8 flex flex-col space-y-8 justify-center items-center">
   <h1 class="title text-2xl title-primary-500">
-    <%= gettext("Listing Ammo") %>
+    <%= gettext("Ammo") %>
   </h1>
 
   <%= if @ammo_groups |> Enum.empty?() do %>