Corected LANGID for 'sr'.

[LANG_SERBIAN, SUBLANG_SERBIAN_LATIN] corresponds to the LANGID 0x081a.

Original by alexeypa@chromium.org, patch from issue 18333009.

Review URL: https://codereview.chromium.org/18695006

git-svn-id: http://grit-i18n.googlecode.com/svn/trunk@132 7262f16d-afe8-6277-6482-052fa10e57b1