For all I know, this is just a question that someone has to answer. But I'm wondering why ladwiki does not show the Sp-contributions-footer on User Contributions page. The file exists; it's here.
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This is because the message is shown from content language, not the user's interface language unlike most messages. See https://lad.wikipedia.org/wiki/Especial:%C3%80justamientos/Glaisher?uselang=lad