[ticket/12563] Changes 2 style specific language variables for better understanding

Little changes on two language variables. 

PHPBB3-12563 -  https://tracker.phpbb.com/browse/PHPBB3-12563
This is inconsistent with other messages, e.g.
![information_1402702289662](https://cloud.githubusercontent.com/assets/189375/3276794/e106ab6e-f352-11e3-9f81-93184cbda237.png)