i18n: consistency tweaks

- Replace http by https
- Add Special:MyLanguage

Spotted by Siebrand
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Configure-ext-schemachange/en
https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Configure-summary/en

Change-Id: I4370a8227e4def7c4ff78ba34d3e12d9067bc617