Ah, ugh. I see, it's the Twitter part. If you want to internationalize this please do this:

```
twitter_text = _(u"I just registered for {number} {title} through {account}").replace(' ', '+')
tweet_action = "http://twitter.com/intent/tweet?text={twitter_text}:+{url}".format(
    twitter_text=twitter_text,
    ...
```