GEVER: The login form styling is incorrect in some cases.

Incorrect styled login form:
![bildschirmfoto 2013-06-05 um 08 23 35](https://f.cloud.github.com/assets/485755/610115/60ca0f9c-cda9-11e2-881f-1b95f565309c.png)

correct styled loging form, when validation error is displayed:
![bildschirmfoto 2013-06-05 um 08 23 57](https://f.cloud.github.com/assets/485755/610123/b4f70426-cda9-11e2-8948-ca03014c7006.png)