Wrap text if too long in mobile notifications

My bad https://github.com/diaspora/diaspora/pull/3981

# Before

![Pantallazo-1](https://f.cloud.github.com/assets/1108789/169330/824646c8-7a1a-11e2-83ce-06928e4b3a07.png)

# After

![Pantallazo](https://f.cloud.github.com/assets/1108789/169331/88bb8982-7a1a-11e2-886d-557be6ba592f.png)