caller Title

local p = {}  function p.title(frame) return frame:getParent():getTitle() end  function p.lang(frame) local base = frame.args.base local title = p.title(frame) if base ~= title then local parts = mw.text.split(p.title(frame), '/', true) return parts[#parts] else -- we’re on the base page of the translation (directly, it’s not translated from somewhere), -- so we have no subpage language code, but we use PAGELANGUAGE return frame:preprocess('{{PAGELANGUAGE}}') end end  return p