style: consistent back button and some translations

lib/mv_web/live/role_live/show.ex

@@ -161,10 +161,7 @@ defmodule MvWeb.RoleLive.Show do
     ~H"""
     <Layouts.app flash={@flash} current_user={@current_user}>
       <.header>
-        {gettext("Role")} {@role.name}
-        <:subtitle>{gettext("Role details and permissions.")}</:subtitle>
-
-        <:actions>
+        <:leading>
           <.button
             navigate={~p"/admin/roles"}
             variant="neutral"
@@ -173,13 +170,18 @@ defmodule MvWeb.RoleLive.Show do
             <.icon name="hero-arrow-left" class="size-4" />
             {gettext("Back")}
           </.button>
+        </:leading>
+        {gettext("Role")} {@role.name}
+        <:subtitle>{gettext("Role details and permissions.")}</:subtitle>
+
+        <:actions>
           <%= if can?(@current_user, :update, Mv.Authorization.Role) do %>
             <.button
               variant="primary"
               navigate={~p"/admin/roles/#{@role}/edit"}
               data-testid="role-show-edit-btn"
             >
-              {gettext("Edit role")}
+              <.icon name="hero-pencil-square" /> {gettext("Edit role")}
             </.button>
           <% end %>
         </:actions>