Fixing stable 26 migrations

Still failing with:

```
The following content types are stale and need to be deleted:

    pootle_app | suggestion

Any objects related to these content types by a foreign key will also
be deleted. Are you sure you want to delete these content types?
If you're unsure, answer 'no'.

    Type 'yes' to continue, or 'no' to cancel: 

No output has been received in the last 10 minutes, this potentially indicates a stalled
build or something wrong with the build itself.

The build has been terminated
```

But decided to pull in d4e1bde2 so we can move forward.