Updated mediawiki/extensions
Project: mediawiki/extensions/Translate  6ac50811731e80fe21e7f95cd3ac2a214a0aaee7

Remove two unused messages

Were added with initial page translation feature in f340747f
Were not removed when the two-step process was introduced in 819b34d

Change-Id: Iba5f8f3f7361b95cd782dd7e3a777c3b05b4bcfe