Refactor language settings in documentation configuration

- Removed redundant language variable from `conf.py` and directly set 'en' in `html_context`.
- Cleaned up comments related to language options for clarity.

Author: adamzhang1987

docs/source/conf.py

@@ -39,12 +39,6 @@
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
 
-# The language for content autogenerated by Sphinx. Refer to documentation
-# for a list of supported languages.
-#
-# This is also used if you do content translation via gettext catalogs.
-# Usually you set "language" from the command line for these cases.
-language = 'en'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
@@ -64,18 +58,12 @@
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
 
-# -- Options for internationalization ----------------------------------------
-
-# The language for content autogenerated by Sphinx. Refer to documentation
-# for a list of supported languages.
-language = 'en'
-
 # -- Options for ReadTheDocs ------------------------------------------------
 
 # ReadTheDocs specific settings
 html_context = {
     'display_language_tabs': True,
-    'current_language': language,
+    'current_language': 'en',
     'languages': {
         'en': 'English',
         'zh_CN': '中文',