feature: add pt_BR locale support (ant-design#4004)

components/calendar/locale/pt_BR.tsx

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+import pt_BR from '../../date-picker/locale/pt_BR';
+export default pt_BR;

components/date-picker/locale/pt_BR.tsx

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+import CalendarLocale from 'rc-calendar/lib/locale/pt_BR';
+import TimePickerLocale from '../../time-picker/locale/pt_BR';
+import assign from 'object-assign';
+
+// 统一合并为完整的 Locale
+const locale = {
+  lang: assign({
+    placeholder: 'Selecionar data',
+    rangePlaceholder: ['Data de início', 'Data de fim'],
+  }, CalendarLocale),
+  timePickerLocale: assign({}, TimePickerLocale),
+};
+
+// All settings at:
+// https://github.com/ant-design/ant-design/issues/424
+
+export default locale;

components/locale-provider/pt_BR.tsx

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+import moment from 'moment';
+import 'moment/locale/pt-br';
+moment.locale('pt-br');
+
+import Pagination from '../pagination/locale/pt_BR';
+import DatePicker from '../date-picker/locale/pt_BR';
+import TimePicker from '../time-picker/locale/pt_BR';
+import Calendar from '../calendar/locale/pt_BR';
+
+export default {
+  Pagination,
+  DatePicker,
+  TimePicker,
+  Calendar,
+  Table: {
+    filterTitle: 'Filtro',
+    filterConfirm: 'OK',
+    filterReset: 'Resetar',
+    emptyText: 'Não há dados',
+  },
+  Modal: {
+    okText: 'OK',
+    cancelText: 'Cancelar',
+    justOkText: 'OK',
+  },
+  Popconfirm: {
+    okText: 'OK',
+    cancelText: 'Cancelar',
+  },
+  Transfer: {
+    notFoundContent: 'Não encontrado',
+    searchPlaceholder: 'Procurar',
+    itemUnit: 'item',
+    itemsUnit: 'items',
+  },
+  Select: {
+    notFoundContent: 'Não encontrado',
+  },
+};

components/pagination/locale/pt_BR.tsx

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+export default {
+  // Options.jsx
+  items_per_page: '/ páginas',
+  jump_to: 'Vá até',
+  page: '',
+
+  // Pagination.jsx
+  prev_page: 'Página anterior',
+  next_page: 'Próxima página',
+  prev_5: '5 páginas anteriores',
+  next_5: '5 próximas páginas',
+};

components/time-picker/locale/pt_BR.tsx

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+const locale = {
+  placeholder: 'Hora',
+};
+
+export default locale;