Bug fix: Translate: CLD2 imcompatibility

CLD2 returns zh-Hant insteaad of zh-TW, but this is an incompatible behavior.  I fixed it by simply converting it in Chromium.

Some other language codes than zh-TW/Hant are also changed, but they doesn't affect the Translate feature.

BUG=301360

Review URL: https://codereview.chromium.org/25212002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226449 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226449