remove unused module and fix language default

Author: drbruced12

conf.py

@@ -58,7 +58,6 @@ def get_version():
     'sphinx.ext.autosectionlabel',
     'sphinx.ext.coverage',
     'sphinx.ext.ifconfig',
-    'sphinx.ext.intersphinx',
     'sphinx.ext.mathjax',
     'sphinx.ext.todo',
     'sphinxcontrib.spelling',
@@ -85,7 +84,7 @@ def get_version():
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = 'en'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.