Replies are very broken if i18n is German on 0.7.3

```json
{
"origin_server_ts": 1537124146491,
"sender": "@delta1:matrix.org",
"event_id": "$1537124146334727yCZzW:matrix.org",
"unsigned": {
"age": 6935
},
"content": {
"body": "\n>Als Antwort auf @matthew:sandbox.modular.im
matrix is amazing when it works.\nYeah it is. Luckily if you're not on matrix.org it usually does\n\nWhy? ",
"msgtype": "m.text",
"formatted_body": "

\n

Als Antwort auf @matthew:sandbox.modular.im
matrix is amazing when it works.
\nYeah it is. Luckily if you're not on matrix.org it usually does

\n

\n

Why?

",
"format": "org.matrix.custom.html"
},
"type": "m.room.message",
"room_id": "!QtykxKocfZaZOUrTwp:matrix.org"
}
```

Start by reproducing a reply with German selected in the iOS app, using the supplied event payload and screenshot as the reference. Compare the rendered reply with the event's body and formatted_body; done means replies display correctly in German without the reported breakage.

Written by the indexing model from the issue text.