[enh] is_valid_lang moved to utils

searx/engines/dictzone.py

 from lxml import html
 from cgi import escape
 from searx.engines.xpath import extract_text
-from searx.languages import language_codes
+from searx.utils import is_valid_lang
 
 categories = ['general']
 url = 'http://dictzone.com/{from_lang}-{to_lang}-dictionary/{query}'
 results_xpath = './/table[@id="r"]/tr'
 
 
-def is_valid_lang(lang):
-    is_abbr = (len(lang) == 2)
-    if is_abbr:
-        for l in language_codes:
-            if l[0][:2] == lang.lower():
-                return (True, l[1].lower())
-        return False
-    else:
-        for l in language_codes:
-            if l[1].lower() == lang.lower():
-                return (True, l[1].lower())
-        return False
-
-
 def request(query, params):
     m = parser_re.match(unicode(query, 'utf8'))
     if not m:
     if not from_lang or not to_lang:
         return params
 
-    params['url'] = url.format(from_lang=from_lang[1],
-                               to_lang=to_lang[1],
+    params['url'] = url.format(from_lang=from_lang[2],
+                               to_lang=to_lang[2],
                                query=query)
 
     return params

searx/engines/translated.py

 from lxml import html
 from cgi import escape
 from searx.engines.xpath import extract_text
-from searx.languages import language_codes
+from searx.utils import is_valid_lang
 
 categories = ['general']
 url = 'http://api.mymemory.translated.net/get?q={query}' \
 api_key = ''
 
 
-def is_valid_lang(lang):
-    is_abbr = (len(lang) == 2)
-    if is_abbr:
-        for l in language_codes:
-            if l[0][:2] == lang.lower():
-                return (True, l[0][:2], l[1].lower())
-        return False
-    else:
-        for l in language_codes:
-            if l[1].lower() == lang.lower():
-                return (True, l[0][:2], l[1].lower())
-        return False
-
-
 def request(query, params):
     m = parser_re.match(unicode(query, 'utf8'))
     if not m:

searx/utils.py

 from random import choice
 
 from searx.version import VERSION_STRING
+from searx.languages import language_codes
 from searx import settings
 from searx import logger
 
         filesize = None
 
     return filesize
+
+
+def is_valid_lang(lang):
+    is_abbr = (len(lang) == 2)
+    if is_abbr:
+        for l in language_codes:
+            if l[0][:2] == lang.lower():
+                return (True, l[0][:2], l[1].lower())
+        return False
+    else:
+        for l in language_codes:
+            if l[1].lower() == lang.lower():
+                return (True, l[0][:2], l[1].lower())
+        return False