PIM-2000 Displayed login page labels as icons

```
Bug fix: yes
Feature addition: no
Backwards compatibility break: no
Unit test passes: yes
Specs passes: yes
Behat scenario passes: yes
Checkstyle issues: no
ChangeLog updated: no
Documentation PR:
Fixes the following jira:
  - PIM-2000
```
![capture du 2014-02-13 18 02 37](https://f.cloud.github.com/assets/668604/2162365/732e0bd0-94d1-11e3-909f-baba39026bcc.png)