fix: axe-core critical and major issues

lib/mv_web/live/user_live/show.ex

@@ -10,8 +10,9 @@ defmodule MvWeb.UserLive.Show do
         <:subtitle>{gettext("This is a user record from your database.")}</:subtitle>
 
         <:actions>
-          <.button navigate={~p"/users"}>
+          <.button navigate={~p"/users"} aria-label={gettext("Back to users list")}>
             <.icon name="hero-arrow-left" />
+            <span class="sr-only">{gettext("Back to users list")}</span>
           </.button>
           <.button variant="primary" navigate={~p"/users/#{@user}/edit?return_to=show"}>
             <.icon name="hero-pencil-square" /> {gettext("Edit User")}