python3Packages.wagtail-localize: add missing assets (#475355)

pkgs/development/python-modules/wagtail-localize/default.nix

@@ -1,6 +1,7 @@
 {
   lib,
   buildPythonPackage,
+  buildNpmPackage,
 
   # build-system
   flit-core,
@@ -22,11 +23,10 @@
   freezegun,
   python,
 }:
-
-buildPythonPackage rec {
+let
   pname = "wagtail-localize";
+
   version = "1.13.1";
-  pyproject = true;
 
   src = fetchFromGitHub {
     repo = "wagtail-localize";
@@ -35,6 +35,33 @@ buildPythonPackage rec {
     hash = "sha256-iJwX/N8/aaAjinU1htVasp88fuuZCOomVPgJ1Ymxre4=";
   };
 
+  assets = buildNpmPackage {
+    pname = "${pname}-assets";
+    npmDepsHash = "sha256-mLZaa3BBvbbgaSgZhsdUVPRXR6X5xy/sWRiOXnzV2cQ=";
+
+    NODE_OPTIONS = "--openssl-legacy-provider";
+
+    inherit version src;
+
+    installPhase = ''
+      runHook preInstall
+
+      mkdir $out
+
+      for static_dir in wagtail_localize/static; do
+        cp --parents -r $static_dir $out
+      done
+
+      runHook postInstall
+    '';
+  };
+in
+
+buildPythonPackage rec {
+  inherit pname version src;
+
+  pyproject = true;
+
   build-system = [ flit-core ];
 
   dependencies = [
@@ -56,6 +83,10 @@ buildPythonPackage rec {
     google-cloud-translate
   ];
 
+  preBuild = ''
+    cp -r ${assets}/wagtail_localize .
+  '';
+
   # See https://github.com/wagtail/wagtail-localize/issues/922
   patches = [ ./failing-test.patch ];