Revert "Revert "removing unused extension extensions/Translate""

This reverts commit 1070e0f96e5a569ea80d615b0953350fa581fafa.
Revert "Revert "removing unused extension Contest""

This reverts commit a9fac8c1d094934ee1bbfdd1a2a6e6c1c1e7905a.
Revert "Revert "removing unused extension extensions/CentralAuth""

This reverts commit db8bb76ad4306d3bf64873083fa65ed70cddcbb2.