Fix CSV upload file reading

Handle consume_uploaded_entries returning [content] directly
instead of [{:ok, content}]. Add locale support for translations
in background tasks.

lib/mv_web/live/global_settings_live.ex

@@ -59,9 +59,13 @@ defmodule MvWeb.GlobalSettingsLive do
   @max_errors 50
 
   @impl true
-  def mount(_params, _session, socket) do
+  def mount(_params, session, socket) do
     {:ok, settings} = Membership.get_settings()
 
+    # Get locale from session for translations
+    locale = session["locale"] || "de"
+    Gettext.put_locale(MvWeb.Gettext, locale)
+
     socket =
       socket
       |> assign(:page_title, gettext("Settings"))
@@ -70,6 +74,7 @@ defmodule MvWeb.GlobalSettingsLive do
       |> assign(:import_state, nil)
       |> assign(:import_progress, nil)
       |> assign(:import_status, :idle)
+      |> assign(:locale, locale)
       |> assign_form()
       # Configure file upload with auto-upload enabled
       # Files are uploaded automatically when selected, no need for manual trigger
@@ -586,6 +591,10 @@ defmodule MvWeb.GlobalSettingsLive do
       actor: actor
     ]
 
+    # Get locale from socket for translations in background tasks
+    locale = socket.assigns[:locale] || "de"
+    Gettext.put_locale(MvWeb.Gettext, locale)
+
     if Config.sql_sandbox?() do
       # Run synchronously in tests to avoid Ecto Sandbox issues with async tasks
       {:ok, chunk_result} =
@@ -604,6 +613,9 @@ defmodule MvWeb.GlobalSettingsLive do
       # Use start_child for fire-and-forget: no monitor, no Task messages
       # We only use our own send/2 messages for communication
       Task.Supervisor.start_child(Mv.TaskSupervisor, fn ->
+        # Set locale in task process for translations
+        Gettext.put_locale(MvWeb.Gettext, locale)
+
         {:ok, chunk_result} =
           MemberCSV.process_chunk(
             chunk,
@@ -674,13 +686,19 @@ defmodule MvWeb.GlobalSettingsLive do
   end
 
   defp consume_and_read_csv(socket) do
-    consume_uploaded_entries(socket, :csv_file, fn %{path: path}, _entry ->
-      case File.read(path) do
-        {:ok, content} -> {:ok, content}
-        {:error, reason} -> {:error, Exception.message(reason)}
-      end
-    end)
+    result =
+      consume_uploaded_entries(socket, :csv_file, fn %{path: path}, _entry ->
+        case File.read(path) do
+          {:ok, content} -> {:ok, content}
+          {:error, reason} -> {:error, Exception.message(reason)}
+        end
+      end)
+
+    result
     |> case do
+      [content] when is_binary(content) ->
+        {:ok, content}
+
       [{:ok, content}] when is_binary(content) ->
         {:ok, content}