Update SRF_Filtered.php

Amend name of the message key to correspond to the I18n file and thus regain consistency (see https://github.com/SemanticMediaWiki/SemanticResultFormats/issues/71)
Merge pull request #72 from SemanticMediaWiki/71

Update SRF_Filtered.php
Fix Travis for MW 1.25
Merge branch 'master' of ssh://wmfgerrit/mediawiki/extensions/SemanticResultFormats