added missing formatExport and ClearFilters

src/locale/bootstrap-table-pt-BR.js

@@ -33,6 +33,12 @@
         },
         formatNoMatches: function () {
             return 'Nenhum registro encontrado';
+        },
+        formatExport: function () {
+            return 'Exportar dados';
+        },
+        formatClearFilters: function () {
+            return 'Remover filtros';
         }
     };