Allow to change language

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/graphql/resolvers/user.ex

@@ -477,4 +477,13 @@ defmodule Mobilizon.GraphQL.Resolvers.User do
         {:error, "Error while saving user setting"}
     end
   end
+
+  def update_locale(_parent, %{locale: locale}, %{
+        context: %{current_user: %User{id: logged_user_id, locale: current_locale} = user}
+      }) do
+    with true == current_locale != locale,
+         {:ok, %User{} = updated_user} <- Users.update_user(user, %{locale: locale}) do
+      {:ok, updated_user}
+    end
+  end
 end