Celine Dion wept tears of joy on Saturday as she fulfilled her dream of returning to the stage after years battling a rare neurological disorder, with a sell-out concert in Paris.The 58-year-old French-Canadian singer appeared visibly moved as she opened her first full concert in six years with her 1990s French-language ballad “On ne change pas” (“One Doesn’t Change”), singing to a crowd of 30,000 enthralled fans that one newspaper said included US former first lady Michelle Obama.“These are,...