Facia tool: html sanitizer

Sanitizes html in headlines, trailtext, etc:
* balances any open & closing tags
* strips everything including and after a `<script...`
Won't this turn 

```html
<script>
alert("LOLE");
</script>
```

into

```html
alert("LOLE");
</script>
```
?

Might be better to add an endpoint for this and do it on the server using a good library designed for the purpose. TagSoup is very good for this kinda stuff and won't run into edge cases.