Modified language setting value to string value.
# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
locale_dirs = ['locale/']
-language = en
+language = 'en'
# There are two options for replacing |today|: either, you set today to some
# non-false value, then it is used:
# The language for content autogenerated by Sphinx. Refer to documentation
# for a list of supported languages.
locale_dirs = ['locale/']
-language = ko
+language = 'ko'
# There are two options for replacing |today|: either, you set today to some
# non-false value, then it is used: