[mod] purge local html_to_text

searx/engines/duckduckgo_definitions.py

 import json
 from urllib import urlencode
 from lxml import html
+from searx.utils import html_to_text
 from searx.engines.xpath import extract_text
 
 url = 'https://api.duckduckgo.com/'\
         return text
 
 
-def html_to_text(htmlFragment):
-    dom = html.fromstring(htmlFragment)
-    return extract_text(dom)
-
-
 def request(query, params):
     # TODO add kl={locale}
     params['url'] = url.format(query=urlencode({'q': query}))