[mod] remove unused import

use
from searx.engines.duckduckgo import _fetch_supported_languages, supported_languages_url  # NOQA
so it is possible to easily remove all unused import using autoflake:
autoflake --in-place --recursive --remove-all-unused-imports searx tests

searx/engines/google_videos.py

@@ -11,7 +11,6 @@
 """
 
 from datetime import date, timedelta
-from json import loads
 from urllib.parse import urlencode
 from lxml import html
 from searx.utils import extract_text