hacked Zend_Locale to allow lc_XX locale

related issue: #1457
also related: http://open.silverstripe.org/ticket/7386

besides changing Zend_Locale to allow lc_XX I also reverted 2 previous commits that removed lc_XX:
9a52dae207b36293585973d5974072f7bc8ecd4b
ed19bbc3ba2924b2270edbab492e799bfaa0f0f5