style: consistent back button and some translations

lib/mv_web/live/user_live/index.html.heex

@@ -19,33 +19,6 @@
     sort_field={@sort_field}
     sort_order={@sort_order}
   >
-    <:col
-      :let={user}
-      label={
-        ~H"""
-        <.input
-          type="checkbox"
-          name="select_all"
-          phx-click="select_all"
-          checked={Enum.sort(@selected_users) == Enum.map(@users, &to_string(&1.id)) |> Enum.sort()}
-          aria-label={gettext("Select all users")}
-          role="checkbox"
-        />
-        """
-      }
-    >
-      <.input
-        type="checkbox"
-        name={to_string(user.id)}
-        phx-click="select_user"
-        phx-value-id={to_string(user.id)}
-        checked={to_string(user.id) in @selected_users}
-        phx-capture-click
-        phx-stop-propagation
-        aria-label={gettext("Select user")}
-        role="checkbox"
-      />
-    </:col>
     <:col
       :let={user}
       sort_field={:email}