Fix some localization issues. Remove spurious pages at...

Fix some localization issues. Remove spurious pages at intl/lang/design/index.html that were dupes of intl/lang/design/material/index.html. Remove empty <lang>-lang attrs that caused display errors. Remove some unnecessary TOC items.
am: ef4e6c76

* commit 'ef4e6c76':
  Fix some localization issues. Remove spurious pages at intl/lang/design/index.html that were dupes of intl/lang/design/material/index.html. Remove empty <lang>-lang attrs that caused display errors. Remove some unnecessary TOC items.