Token revoked i18n message doesn't show correctly in Chrome

[Sneezry]

This issue happens when sign in Google Drive in Chrome.

[mymindstorm]

This is mostly because the client ID that is used by default is limited to production use, you need to make test credentials and change the client id in chrome-manifest.json.

There is a string substitution feature built into i18n.getMessage that I was unaware of that uses the $ symbol. Likely because of the implementation of this feature Chrome decides to remove the preceding ${, causing the regex to miss the substitution.

PR with fixes at #252