Get the language string before use it to avoid reuse freed buffer.

Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14241 6f19259b-4bc3-4df7-8a09-765794883524
New EDK Shell binary(r62).

Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14242 6f19259b-4bc3-4df7-8a09-765794883524