Localisation updates from https://translatewiki.net.

Change-Id: I753553926ad75e9a59b7a16070b8b743e405132f
Localisation updates from https://translatewiki.net.

Change-Id: I41f0ecac64dd5cb00ec6a213c3b6c38bd5f285ad
Update SemanticExtraSpecialProperties.php

* Update version number (flagged since this is more sane)
* Typos and tweaks
* Added more authors to the file documentation
* Added "and others" to extension's registry
* Moved Säsongsmat.nu to the file documentation section since this is not an author
Update CHANGELOG.md

* Added release dates
* Tweaks
Localisation updates from https://translatewiki.net.

Change-Id: I6224b907d4b4d55e15fd0bc58cb15fe8454c3f66
Update CONTRIBUTING.md
Localisation updates from https://translatewiki.net.

Change-Id: Ib8b4e7fe328a239b4d94e5eda6ebf027d8c47497
Update CONTRIBUTING.md
Update README.md
Localisation updates from https://translatewiki.net.

Change-Id: I9c6f2a2160e5de550f45e8dd2cd30d40fa3cdfcd
Localisation updates from https://translatewiki.net.

Change-Id: Idd5adc058506e80950db6a49bd8665d4382ff25e
Merge branch 'master' of ssh://wmfgerrit/mediawiki/extensions/SemanticExtraSpecialProperties
Handle User::newFromName() when returning false
Merge pull request #31 from SemanticMediaWiki/user-false

Handle User::newFromName() when returning false
Update SemanticExtraSpecialProperties.php
Update CHANGELOG.md
Update SemanticExtraSpecialProperties.php
Update composer.json
Update composer.json
Localisation updates from https://translatewiki.net.

Change-Id: Ide8640cc69b0c14fcce0eabb3f25fafd4203c902