[openstreetmap-website] Page title is html-encoded twice (#764)

[Štefan Baebler]

https://www.openstreetmap.org/node/2384279462/ and
https://www.openstreetmap.org/node/2384279462/history

are about node with title "Rock & Roll":
![image](https://cloud.githubusercontent.com/assets/319826/3310703/6e6b67a6-f6b9-11e3-8b56-267429176516.png)

where the page title is shown wrong, as "Rock & Roll‬" via html:
```xml
<title>OpenStreetMap | Vozlišče: ‪Rock &amp; Roll‬ (‪2384279462‬)</title>
```
Notice the double `&amp;` instead of single `&`.

Similar to #571, but there was the problem with ajax request, here it comes from the server in initial html.

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/764
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