[enh] multilingual autocomplete

implemented for wikipedia, qwant and google

searx/autocomplete.py

     return list(result_set)
 
 
-def dbpedia(query):
+def dbpedia(query, lang):
     # dbpedia autocompleter, no HTTPS
     autocomplete_url = 'http://lookup.dbpedia.org/api/search.asmx/KeywordSearch?'
 
     return results
 
 
-def duckduckgo(query):
+def duckduckgo(query, lang):
     # duckduckgo autocompleter
     url = 'https://ac.duckduckgo.com/ac/?{0}&type=list'
 
     return []
 
 
-def google(query):
+def google(query, lang):
     # google autocompleter
     autocomplete_url = 'https://suggestqueries.google.com/complete/search?client=toolbar&'
 
-    response = get(autocomplete_url + urlencode(dict(q=query)))
+    response = get(autocomplete_url + urlencode(dict(hl=lang, q=query)))
 
     results = []
 
     return results
 
 
-def startpage(query):
-    # wikipedia autocompleter
+def startpage(query, lang):
+    # startpage autocompleter
     url = 'https://startpage.com/do/suggest?{query}'
 
     resp = get(url.format(query=urlencode({'query': query}))).text.split('\n')
     return []
 
 
-def qwant(query):
+def qwant(query, lang):
     # qwant autocompleter (additional parameter : lang=en_en&count=xxx )
     url = 'https://api.qwant.com/api/suggest?{query}'
 
-    resp = get(url.format(query=urlencode({'q': query})))
+    resp = get(url.format(query=urlencode({'q': query, 'lang': lang})))
 
     results = []
 
     return results
 
 
-def wikipedia(query):
+def wikipedia(query, lang):
     # wikipedia autocompleter
-    url = 'https://en.wikipedia.org/w/api.php?action=opensearch&{0}&limit=10&namespace=0&format=json'
+    url = 'https://' + lang + '.wikipedia.org/w/api.php?action=opensearch&{0}&limit=10&namespace=0&format=json'
 
     resp = loads(get(url.format(urlencode(dict(search=query)))).text)
     if len(resp) > 1:

searx/webapp.py

     if not query.getSearchQuery():
         return '', 400
 
-    # run autocompleter
+    # get autocompleter
     completer = autocomplete_backends.get(request.cookies.get('autocomplete', settings['search']['autocomplete']))
 
     # parse searx specific autocompleter results like !bang
 
     # normal autocompletion results only appear if max 3 inner results returned
     if len(raw_results) <= 3 and completer:
+        # get language from cookie
+        language = request.cookies.get('language')
+        if not language or language == 'all':
+            language = 'en'
+        else:
+            language = language.split('_')[0]
         # run autocompletion
-        raw_results.extend(completer(query.getSearchQuery()))
+        raw_results.extend(completer(query.getSearchQuery(), language))
 
     # parse results (write :language and !engine back to result string)
     results = []