Update README.md

[skip ci]
Localisation updates from https://translatewiki.net.

Change-Id: I66b5d6554772102ab5829608da62cec8aced52e7
Merge branch 'master' of ssh://wmfgerrit/mediawiki/extensions/SemanticMediaWiki
Update README.md

[skip ci]
Move import benchmark to ImportPageCopyBenchmarkTest