Updated mediawiki/extensions
Project: mediawiki/extensions/DataValues  88ea118121aab4d5de5d0f43a4ca6a1fa3652c43

[DataValues] Added tests for JSON related DataValue functions

* fixes MultilingualTextValue's toJSON()
* add validation for string and bool data values constructor values/BoolValue.js
* documentation updates/fixes

Change-Id: I879751bb6f837a37bcaf95e61d1eaf459df57572