Add missing language for some recipes

recipes/daily_express.recipe

@@ -14,6 +14,7 @@ class AdvancedUserRecipe1390132023(BasicNewsRecipe):
     # 27.6.15 using feed43 as rss feeds dead
     # feed 43 string = <div {*}<a href="{%}"{*}<h4>{%}</h4>
     oldest_article = 1.5
+    language = 'en_GB'
     max_articles_per_feed = 10
     compress_news_images = True
     compress_news_images_max_size = 20

recipes/hvidovreavis_dk.recipe

@@ -5,6 +5,7 @@ from calibre.web.feeds.news import BasicNewsRecipe
 
 class Hvidovre_Avis_dk(BasicNewsRecipe):
     title          = 'Hvidovre avis'
+    language       = 'da'
     oldest_article = 7
     max_articles_per_feed = 50
     auto_cleanup   = True

recipes/ing_dk.recipe

@@ -9,6 +9,7 @@ Ingeniøren.dk
 class Ing_dk(BasicNewsRecipe):
     __author__ = 'CoderAllan.github.com'
     title = 'Ingeniøren'
+    language = 'da'
     description = 'Nyheder om teknologi og naturvidenskab for fagfolk og interesserede; artikler, blogs, debat, infografik, video.'
     category = 'newspaper, news, localnews, sport, culture, Denmark'
     oldest_article = 7

recipes/kristeligt_dagblad_dk.recipe

@@ -5,6 +5,7 @@ from calibre.web.feeds.news import BasicNewsRecipe
 
 class KristeligtDagblad(BasicNewsRecipe):
     title          = 'Kristeligt Dagblad'
+    language = 'da'
     oldest_article = 7
     max_articles_per_feed = 50
     auto_cleanup   = True