Escape all characters above \u007f at the i18n directory

[lgalfaso]

Modify the script that writes the locales so all characters above \u007f are escaped
Run the modified script and update the locales

Closes #2417

[petebacondarwin]

This needs a unit test. To help with this I would suggest that you extract out the serialization of the content into its own function:

function serializeContent(localObj) {
  return JSON.stringify(localeObj, canonicalizeForJsonStringify, '  ')
    .replace(/\¤/g, '\\u00A4')
    .replace(new RegExp('[\\u007f-\\uffff]', 'g'), function(c) { return '\\u'+('0000'+c.charCodeAt(0).toString(16)).slice(-4); })
    .replace(/"@@|@@"/g, '');
});

Then call this in outputLocale:

...
  var content = serializeContent(localeInfo[localeID]);
...

Then write a unit test that can go into i18n/spec/closureI18nExtractorSpec.js

[petebacondarwin]

• Contributor signed CLA now or in the past (if you just signed, leave a comment here with your real name)
• PR doesn't introduce new api
• PR doesn't contain a breaking change
• PR contains unit tests
• PR contains e2e tests (if suitable)
• PR contains documentation update (if suitable)
• PR passes all tests on Travis (sanity)
• PR passes all tests on ci.angularjs.org (cross-browser compatibility)
• PR is rebased against recent master
• PR is squashed into one commit per logical change
• PR's commit messages are descriptive and allows us to autogenerate release notes (required commit message format)
• All changes requested in review have been implemented

Can you check that all these tasks have been completed? Thanks.

[lgalfaso]

Did the refactor to be able to create unit tests. Added two new unit tests.
BTW, already signed the CLA

[petebacondarwin]

Thanks @lgalfaso for a great PR. Merged at: 695c54c