js/lang/SQLShare.json: fix abbrv for December to 'Dec' from 'Dev'

Close an issue I reported via email to sqlshare@uw.edu on 2012-12-06.

Signed-off-by: Daniel Halperin <dhalperi@cs.washington.edu>
js/tagged_queries: make tag search case-insensitive

Close JIRA SQL-518 (https://jira.cac.washington.edu/browse/SQL-518)

Signed-off-by: Daniel Halperin <dhalperi@cs.washington.edu>