[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/utils.py

@@ -7,7 +7,7 @@ from numbers import Number
 from os.path import splitext, join
 from random import choice
 from html.parser import HTMLParser
-from urllib.parse import urljoin, urlparse, unquote
+from urllib.parse import urljoin, urlparse
 
 from lxml import html
 from lxml.etree import XPath, _ElementStringResult, _ElementUnicodeResult