Use REDASH_CSV_WRITER_ENCODING for downloading CSV

redash/handlers/query_results.py

@@ -382,8 +382,10 @@ def make_json_response(query_result):
 
     @staticmethod
     def make_csv_response(query_result):
-        headers = {"Content-Type": "text/csv; charset=UTF-8"}
-        return make_response(serialize_query_result_to_dsv(query_result, ","), 200, headers)
+        headers = {"Content-Type": f"text/csv; charset={settings.CSV_WRITER_ENCODING.upper()}"}
+        return make_response(
+            serialize_query_result_to_dsv(query_result, ",").encode(settings.CSV_WRITER_ENCODING), 200, headers
+        )
 
     @staticmethod
     def make_tsv_response(query_result):

redash/settings/__init__.py

@@ -455,3 +455,5 @@ def email_server_is_configured():
 
 # Email blocked domains, use delimiter comma to separated multiple domains
 BLOCKED_DOMAINS = set_from_string(os.environ.get("REDASH_BLOCKED_DOMAINS", "qq.com"))
+
+CSV_WRITER_ENCODING = os.environ.get("REDASH_CSV_WRITER_ENCODING", "utf-8")