Add missing language to some recipes

recipes/tehelka.recipe

@@ -19,6 +19,7 @@ class Tehelka(BasicNewsRecipe):
     description = u'Free. Fair. Fearless.'
     category = 'news, india'
     encoding = 'utf-8'
+    language = 'en_IN'
     no_stylesheets = True
     remove_empty_feeds = True
     remove_javascript = True

recipes/volksrant.recipe

@@ -7,6 +7,7 @@ class Volkskrant(BasicNewsRecipe):
     title = 'Volkskrant'
     __author__ = 'Cristi Ghera'
     max_articles_per_feed = 100
+    language = 'nl'
     description = 'Volkskrant - Nieuws, achtergronden en columns'
     needs_subscription = False
     resolve_internal_links = True

recipes/zerocalcare.recipe

@@ -10,6 +10,7 @@ class AdvancedUserRecipe1333705905(BasicNewsRecipe):
     description = 'Free Italian Comics'
 
     oldest_article = 7
+    language = 'it'
     max_articles_per_feed = 100
     auto_cleanup = False
     keep_only_tags = [