Approve modified posts

This exact functionality is not available in wordpress core. You may want to completely block them from modifying the published posts. See this capability-
http://codex.wordpress.org/Roles_and_Capabilities#edit_published_posts

Otherwise you’ll need a plugin

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)