Updated mediawiki/extensions
Project: mediawiki/extensions/ContentTranslation  4f7c92706661b0dcfed20e54e86646cd6753777b

MT: Prefetch the mt for next sections in the context

* Introduce MT cache
* On page load, fetch the MT for first section
* While filling the MT in placeholder sections, fetch the translation
  for next section too.

Change-Id: Icfa0731a03d99ea26178c177035a8da54addae16