Updated mediawiki/extensions
Project: mediawiki/extensions/TwitterCards  73a94bd91c0313c9ef1ff99ff896702f886f7caf
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Some consistency tweaks in preparation for adding extension to Translatewiki.net

* Standardize extension secription key
* Standardize extension secription message
* Use single quotes whenever possible
* http -> https

Change-Id: I2913a1dbc32d0ffd455713bb4cfff91072dbe2ff