Update the documentations and fix some little things about the translation feature.

pelican/contents.py

@@ -22,7 +22,7 @@ class Page(object):
             if 'AUTHOR' in settings:
                 self.author = settings['AUTHOR']
 
-        default_lang = settings.get('DEFAULT_LANG', 'en').lower()
+        default_lang = settings.get('DEFAULT_LANG').lower()
         if not hasattr(self, 'lang'):
             self.lang = default_lang
 

pelican/settings.py

@@ -20,6 +20,7 @@ _DEFAULT_CONFIG = {'PATH': None,
                    'REVERSE_ARCHIVE_ORDER': False,
                    'KEEP_OUTPUT_DIRECTORY': False,
                    'CLEAN_URLS': False, # use /blah/ instead /blah.html in urls
+                   'DEFAULT_LANG': 'en',
                   }
 
 def read_settings(filename):