Language Line Prepend Recommendation

I'm not sure if this is still a recommendation and would like some clarification.

It used to be recommended to prepend your language lines with a common word, but I see this is not done everywhere.
``` php
lang('Foo.fooBar'); // Prepended
lang('Foo.bar'); // Not prepended
```

Personally I prefer the non-prepended version, it looks cleaner.