All en-US recipes belong in plain en move the outliers

recipes/climate_progress.recipe

@@ -30,7 +30,7 @@ class ClimateProgress(BasicNewsRecipe):
     encoding = 'utf-8'
     language = 'en'
 
-    lang = 'en-US'
+    lang = 'en'
     direction = 'ltr'
 
     html2lrf_options = [

recipes/epoch_times.recipe

@@ -7,7 +7,7 @@ class EpochTimes(BasicNewsRecipe):
     title = 'The Epoch Times'
     __author__ = 'Kovid Goyal'
     description = 'US general news'
-    language = 'en_US'
+    language = 'en'
     encoding = 'utf-8'
     oldest_article = 2
     max_articles_per_feed = 10

recipes/equestria_daily.recipe

@@ -11,7 +11,7 @@ class AdvancedUserRecipe1639926896(BasicNewsRecipe):
 
     title = "Equestria Daily"
     description = "Everything new in Equestria and beyond!"
-    language = 'en_US'
+    language = 'en'
 
     # Max. supported by website: 50
     max_articles_per_feed = 30

recipes/noaa.recipe

@@ -29,7 +29,7 @@ class NOAA(BasicNewsRecipe):
     use_embedded_content = False
     simultaneous_downloads = 1
     encoding = 'utf-8'
-    lang = 'en-US'
+    lang = 'en'
     language = 'en'
 
     remove_tags = [dict(name=['embed', 'object']), dict(name='div', attrs={'id': 'leftNav'}), dict(name='div', attrs={'id': 'topNav'}), dict(name='div', attrs={'class': 'feedback_box'}), dict(name='div', attrs={'id': 'midBlock'}), dict(name='div', attrs={'id': 'footer'}) ]  # noqa

recipes/nytimes_cooking.recipe

@@ -7,7 +7,7 @@ class NYTCooking(BasicNewsRecipe):
     title          = 'NY Times Cooking'
     description = 'NY Times Cooking Magazine'
     __author__ = 'gourav'
-    language = 'en_US'
+    language = 'en'
     encoding = 'utf-8'
     oldest_article = 2
     max_articles_per_feed = 30

recipes/science_based_medicine.recipe

@@ -17,7 +17,7 @@ class SBM(BasicNewsRecipe):
     category = 'science, sbm, ebm, blog, pseudoscience'
     language = 'en'
 
-    lang = 'en-US'
+    lang = 'en'
 
     conversion_options = {
         'comment': description, 'tags': category, 'publisher': publisher, 'language': lang, 'pretty_print': True

recipes/the_budget_fashionista.recipe

@@ -20,7 +20,7 @@ class TheBudgetFashionista(BasicNewsRecipe):
     encoding = 'utf-8'
     publisher = 'TBF GROUP, LLC.'
     category = 'news, fashion, cosmetics, women'
-    lang = 'en-US'
+    lang = 'en'
     language = 'en'
     auto_cleanup = True
 

recipes/uncrate.recipe

@@ -28,7 +28,7 @@ class Uncrate(BasicNewsRecipe):
     encoding = 'utf-8'
     publisher = 'Zombie corp.'
     category = 'news, gadgets, clothes, cars, DVDs'
-    lang = 'en-US'
+    lang = 'en'
     language = 'en'
 
     html2lrf_options = [