refactor: fix credo warnings, update gettext

lib/mv_web/live/group_live/index.ex

@@ -23,15 +23,15 @@ defmodule MvWeb.GroupLive.Index do
     actor = current_actor(socket)
 
     # Check if user can read groups
-    unless can?(actor, :read, Mv.Membership.Group) do
-      {:ok, redirect(socket, to: ~p"/members")}
-    else
+    if can?(actor, :read, Mv.Membership.Group) do
       groups = load_groups(actor)
 
       {:ok,
        socket
        |> assign(:page_title, gettext("Groups"))
        |> assign(:groups, groups)}
+    else
+      {:ok, redirect(socket, to: ~p"/members")}
     end
   end