fix(i18n): by default put negative sign before currency symbol

It seems that the case where the negative sign goes between the currency
symbol and the numeric value is actually the special case and that locales
that require this have it built in. So we should default to having the
negative sign before the symbol.

See http://cldr.unicode.org/translation/number-patterns and
http://unicode.org/cldr/trac/ticket/5674

Closes angular#10158

Author: petebacondarwin

src/ng/filter/filters.js

@@ -45,9 +45,9 @@
          }
          element(by.model('amount')).clear();
          element(by.model('amount')).sendKeys('-1234');
-         expect(element(by.id('currency-default')).getText()).toBe('($1,234.00)');
-         expect(element(by.id('currency-custom')).getText()).toBe('(USD$1,234.00)');
-         expect(element(by.id('currency-no-fractions')).getText()).toBe('(USD$1,234)');
+         expect(element(by.id('currency-default')).getText()).toBe('-$1,234.00');
+         expect(element(by.id('currency-custom')).getText()).toBe('-USD$1,234.00');
+         expect(element(by.id('currency-no-fractions')).getText()).toBe('-USD$1,234');
        });
      </file>
    </example>