Must I translate the internal links «Special:X/Y|X»?
What just comes to my mind: Never ever change the link [[Special:Types/Date|type]] to [[Especial:Tipos/Fecha|tipo]] because in this case everything breaks for people that use Spanish on a non Spanish wiki. You can only do [[Special:Types/Date|tipo]]. I think that adding an alternate label was possible before so disabling the link check was a pretty bad idea since it will do more harm than good.
Oh, true... Excuse me, Karsten. I will fix it in TranslateWiki. I will notice you. I am busy now, but I will do it and the Twitter issues soon.