[Social-media] Proposed social media postings for LocalisationUpdate blog post

Also posted at https://meta.wikimedia.org/wiki/Social_media/Calendar#April_3 LocalisationUpdate blog post: * t: .@MediaWiki's LocalisationUpdate tool now uses JSON files to update user interface translations automatically: https://blog.wikimedia.org/2014/04/03/modernising-mediawikis-localisation-u… * f/g: +MediaWiki's LocalisationUpdate tool now uses JSON files (instead of PHP) to provide readers with regularly updated translations of the user interface. https://blog.wikimedia.org/2014/04/03/modernising-mediawikis-localisation-u… -- Guillaume Paumier