88def fetch_traits(engine_traits: EngineTraits):
   89    """Fetch languages from Archlinux-Wiki.  The location of the Wiki address of a
   90    language is mapped in a :py:obj:`custom field
   91    <searx.enginelib.traits.EngineTraits.custom>` (``wiki_netloc``).  Depending
   92    on the location, the ``title`` argument in the request is translated.
   93 
   94    .. code:: python
   95 
   96       "custom": {
   97         "wiki_netloc": {
   98           "de": "wiki.archlinux.de",
   99            # ...
  100           "zh": "wiki.archlinuxcn.org"
  101         }
  102         "title": {
  103           "de": "Spezial:Suche",
  104            # ...
  105           "zh": "Special:\u641c\u7d22"
  106         },
  107       },
  108 
  109    """
  110    
  112 
  113    engine_traits.custom['wiki_netloc'] = {}
  114    engine_traits.custom['title'] = {}
  115 
  116    title_map = {
  117        'de': 'Spezial:Suche',
  118        'fa': 'ویژه:جستجو',
  119        'ja': '特別:検索',
  120        'zh': 'Special:搜索',
  121    }
  122 
  123    resp = get('https://wiki.archlinux.org/')
  124    if not resp.ok:  
  125        print("ERROR: response from wiki.archlinux.org is not OK.")
  126 
  127    dom = lxml.html.fromstring(resp.text)  
  128    for a in eval_xpath_list(dom, "//a[@class='interlanguage-link-target']"):
  129 
  130        sxng_tag = language_tag(babel.Locale.parse(a.get('lang'), sep='-'))
  131        
  132        sxng_tag = sxng_tag.split('_')[0]
  133 
  134        netloc = urlparse(a.get('href')).netloc
  135        if netloc != 'wiki.archlinux.org':
  136            title = title_map.get(sxng_tag)
  137            if not title:
  138                print("ERROR: title tag from %s (%s) is unknown" % (netloc, sxng_tag))
  139                continue
  140            engine_traits.custom['wiki_netloc'][sxng_tag] = netloc
  141            engine_traits.custom['title'][sxng_tag] = title  
  142 
  143        eng_tag = extract_text(eval_xpath_list(a, ".//span"))
  144        engine_traits.languages[sxng_tag] = eng_tag  
  145 
  146    engine_traits.languages['en'] = 'English'