Polish some docs, add patterns.md

Change-Id: Idb02a46f8b75e85289812ed2f8a108f0b084666e
Localisation updates from http://translatewiki.net.

Change-Id: I35c6684083e3d3c8e0eb04a12d391a999cd7b082
(Bug 56643) Special:ExportRDF $lexicalForm needs to be a string

$dataItem->getNumber() needs to be converted into a string

Change-Id: I3c35d66447638b36bbb45db9fca2bec5436e989a
Tweak some test settings

Change-Id: Iaf0dd9d9d29916606ed2fb11d495f81c9f06229a