CALGARY-CP-The plaintiffs who successfully sued Canada over discrimination in the child welfare system gave emotional speeches on Thursday urging First Nations chiefs to support a landmark $47.8-billion deal to reform that system. The deal was struck in July between Canada, the Chiefs of Ontario, Nishnawbe Aski Nation and the Assembly of First Nations after a nearly two-decade legal fight over the federal government’s underfunding of on-reserve child welfare services. The Canadian Human Rights Tribunal said that was discriminatory. It tasked Canada with coming to an agreement with First Nations to reform the system, and also with compensating children who were torn from their families and put in foster care. Chiefs are in Calgary this week for an Assembly of First Nations gathering where they are set to vote on the…