Bug 1087441: Apply font fix to FMD panel header. r=arthurcc

We could define an AMD module named 'findmydevice` by:
```
define('findmydevice', ['modules/settings_utils', 'shared/settings_listener'], function() { ... });
```
And require the `findemydevice` module when l10n is ready. By doing this the module could also be loaded explicitly in the unit test file.