Retweets and twitts linked in conversations are not filtered

When a filtered word appears in a retweeted tweet or in a tweet that is part of a conversation, it is not matched.

I think that the problem is here:
```javascript
var contentDOM = getElementByClass("tweet-text", status);
var content = (contentDOM.length > 0) ? contentDOM[0].textContent : "";
var contentHTML = (contentDOM.length > 0) ? contentDOM[0].innerHTML : "";
```

Only first match of tweet-text class in status is filtered. But in this cases, filtered word is found after first child.