[fix] html tag removal

searx/engines/xpath.py

 from urllib import urlencode, unquote
 from urlparse import urlparse, urljoin
 from lxml.etree import _ElementStringResult
+from searx.utils import html_to_text
 
 search_url = None
 url_xpath = None
         return ''.join(xpath_results)
     else:
         # it's a element
-        return xpath_results.text_content()
+        return html_to_text(xpath_results.text_content())
 
 
 def extract_url(xpath_results):