Fix initialization of srfgScriptPath
Migrate to JSON i18n

Procedure per https://www.mediawiki.org/wiki/Manual:GenerateJsonI18n.php
with shim.

Change-Id: Ibe3dcb0634713f8efaf4fb6c6fa0834f0cfc30e9
Merge branch 'master' of github.com:SemanticMediaWiki/SemanticResultFormats
Merge branch 'master' of ssh://wmfgerrit/mediawiki/extensions/SemanticResultFormats