Add pt-BR for localization.

Taken into account multiple locales support, and not custom build.

src/locale/pt-BR.js

+import "locale";
+
+d3.locale.pt_BR = d3.locale({
+  decimal: ',',
+  thousands: '.',
+  grouping: [3],
+  currency: ['R$', ''],
+  dateTime: '%A, %e de %B de %Y. %X',
+  date: '%d/%m/%Y',
+  time: '%H:%M:%S',
+  periods: ['AM', 'PM'],
+  days: ['Domingo', 'Segunda', 'Terça', 'Quarta', 'Quinta', 'Sexta', 'Sábado'],
+  shortDays: ['Dom', 'Seg', 'Ter', 'Qua', 'Qui', 'Sex', 'Sáb'],
+  months: ['Janeiro', 'Fevereiro', 'Março', 'Abril', 'Maio', 'Junho', 'Julho', 'Agosto', 'Setembro', 'Outubro', 'Novembro', 'Dezembro'],
+  shortMonths: ['Jan', 'Fev', 'Mar', 'Abr', 'Mai', 'Jun', 'Jul', 'Ago', 'Set', 'Out', 'Nov', 'Dez']
+});

test/locale/locale-ptbr-test.js

+var vows = require("vows"),
+    load = require("../load"),
+    assert = require("../assert"),
+    time = require("../time/time"),
+    local = time.local;
+
+var suite = vows.describe("d3.locale");
+
+suite.addBatch({
+  "locale": {
+    topic: load("locale/pt-BR").expression("d3.locale.pt_BR"),
+
+    "numberFormat": {
+      topic: function(locale) {
+        return locale.numberFormat;
+      },
+      "formats numbers": function(format) {
+        var f = format(",.2f");
+        assert.equal(f(12345.67), "12.345,67");
+      },
+      "formats currencies": function(format) {
+        var f = format("$,.2f");
+        assert.equal(f(12345.67), "R$12.345,67");
+      },
+      "formats currencies with SI-prefix notation and currency suffix": function(format) {
+        var f = format("$,.4s");
+        assert.equal(f(12345.67), "R$12,35k");
+      }
+    },
+
+    "timeFormat": {
+      topic: function(locale) {
+        return locale.timeFormat;
+      },
+
+      "format": {
+        "formats locale date and time": function(format) {
+          var f = format("%c");
+          assert.equal(f(local(1990, 0, 1)), "Segunda,  1 de Janeiro de 1990. 00:00:00");
+        },
+        "formats locale date": function(format) {
+          var f = format("%x");
+          assert.equal(f(local(1990, 0, 1)), "01/01/1990");
+        },
+        "formats locale time": function(format) {
+          var f = format("%X");
+          assert.equal(f(local(1990, 0, 1)), "00:00:00");
+        },
+        "formats abbreviated weekday": function(format) {
+          var f = format("%a");
+          assert.equal(f(local(1990, 0, 1)), "Seg");
+          assert.equal(f(local(1990, 0, 2)), "Ter");
+          assert.equal(f(local(1990, 0, 3)), "Qua");
+          assert.equal(f(local(1990, 0, 4)), "Qui");
+          assert.equal(f(local(1990, 0, 5)), "Sex");
+          assert.equal(f(local(1990, 0, 6)), "Sáb");
+          assert.equal(f(local(1990, 0, 7)), "Dom");
+        },
+        "formats weekday": function(format) {
+          var f = format("%A");
+          assert.equal(f(local(1990, 0, 1)), "Segunda");
+          assert.equal(f(local(1990, 0, 2)), "Terça");
+          assert.equal(f(local(1990, 0, 3)), "Quarta");
+          assert.equal(f(local(1990, 0, 4)), "Quinta");
+          assert.equal(f(local(1990, 0, 5)), "Sexta");
+          assert.equal(f(local(1990, 0, 6)), "Sábado");
+          assert.equal(f(local(1990, 0, 7)), "Domingo");
+        },
+        "formats abbreviated month": function(format) {
+          var f = format("%b");
+          assert.equal(f(local(1990, 0, 1)), "Jan");
+          assert.equal(f(local(1990, 1, 1)), "Fev");
+          assert.equal(f(local(1990, 2, 1)), "Mar");
+          assert.equal(f(local(1990, 3, 1)), "Abr");
+          assert.equal(f(local(1990, 4, 1)), "Mai");
+          assert.equal(f(local(1990, 5, 1)), "Jun");
+          assert.equal(f(local(1990, 6, 1)), "Jul");
+          assert.equal(f(local(1990, 7, 1)), "Ago");
+          assert.equal(f(local(1990, 8, 1)), "Set");
+          assert.equal(f(local(1990, 9, 1)), "Out");
+          assert.equal(f(local(1990, 10, 1)), "Nov");
+          assert.equal(f(local(1990, 11, 1)), "Dez");
+        },
+        "formats month": function(format) {
+          var f = format("%B");
+          assert.equal(f(local(1990, 0, 1)), "Janeiro");
+          assert.equal(f(local(1990, 1, 1)), "Fevereiro");
+          assert.equal(f(local(1990, 2, 1)), "Março");
+          assert.equal(f(local(1990, 3, 1)), "Abril");
+          assert.equal(f(local(1990, 4, 1)), "Maio");
+          assert.equal(f(local(1990, 5, 1)), "Junho");
+          assert.equal(f(local(1990, 6, 1)), "Julho");
+          assert.equal(f(local(1990, 7, 1)), "Agosto");
+          assert.equal(f(local(1990, 8, 1)), "Setembro");
+          assert.equal(f(local(1990, 9, 1)), "Outubro");
+          assert.equal(f(local(1990, 10, 1)), "Novembro");
+          assert.equal(f(local(1990, 11, 1)), "Dezembro");
+        },
+        "formats AM or PM": function(format) {
+          var f = format("%p");
+          assert.equal(f(local(1990, 0, 1, 0)), "AM");
+          assert.equal(f(local(1990, 0, 1, 13)), "PM");
+        }
+      },
+
+      "parse": {
+        "parses locale date and time": function(format) {
+          var p = format("%c").parse;
+          assert.deepEqual(p("Segunda,  1 de Janeiro de 1990. 00:00:00"), local(1990, 0, 1));
+        },
+        "parses locale date": function(format) {
+          var p = format("%x").parse;
+          assert.deepEqual(p("01/01/1990"), local(1990, 0, 1));
+        }
+      }
+    }
+  }
+});
+
+suite.export(module);