Bug fix: Show the language name on chrome://settings/languages panel on Mac OS X

Showing the language name was avoided because there was no option in the right panel on Mac OS X. Now we must show it because "Offer to translate..." checkbox exists there.

BUG=294666
TEST=manual

Review URL: https://chromiumcodereview.appspot.com/23993005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224958 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224958