jp (forums/edit): fixed unicode when dumping in json

sat_frontends/jp/cmd_forums.py

@@ -24,6 +24,7 @@ from sat_frontends.jp.constants import Const as C
 from sat_frontends.jp import common
 from sat.tools.common.ansi import ANSI as A
 from functools import partial
+import codecs
 import json
 
 __commands__ = ["Forums"]
@@ -69,7 +70,9 @@ class Edit(base.CommandBase, common.BaseEdit):
         if forums_json:
             # we loads and dumps to have pretty printed json
             forums = json.loads(forums_json)
-            json.dump(forums, content_file_obj, ensure_ascii=False, indent=4)
+            # cf. https://stackoverflow.com/a/18337754
+            f = codecs.getwriter('utf-8')(content_file_obj)
+            json.dump(forums, f, ensure_ascii=False, indent=4)
             content_file_obj.seek(0)
         self.runEditor("forums_editor_args", content_file_path, content_file_obj)