Revert "#960 - News Module Issue"

This reverts commit 282ba7e59dad7a133073ab228c272716972611c7.
timezone update for articles and news
change initial timezone field from defaulttimezone site_setting to settings.TIME_ZONE

the defaulttimezone site setting is broken - initially it was set to CST. since  CST doesn't exist in any value of the drop down list, if any global setting is edited, the defaulttimezone would be set to Pacific/Midway..
Merge branch 'refs/heads/timezone'
replace release_dt with release_dt_local in news_tags and article_tags