Question Duplicated constant name

I found a problem in v 1.5.6.
When I made php show minor errors to help debug another application, Kunena gave me the following error:
Notice: Constant _PREVIEW_CLOSE already defined in [root]\administrator\components\com_kunena\language\kunena.english.php on line 1174.

When I investigated, I found that there was no duplication within the Kunena package but that another component also used the same constant (sh404sef). Before posting, I looked to see whether the same problem had been already reported. I found other reports of duplicated constant names but not this particular one. Whenever I create a constant in any of my own code, I always use a specific prefix that, while not guaranteeing uniqueness, make it much more likely. Can I suggest that you do something similar (perhaps '_KF_') with Kunena? As the number of components available for Joomla steadily increases, this is likely to be a bigger and bigger issue.
Regards
Phil

PS I couldn't find anywhere that this constant is used!

Hello,

I didn't know that a component third party can do a conflict with constants, so i will report this to the DEVs, for change this and thanks for report this.

New language strings have all prefixes, but old ones do not have -- because of it would mean a lot of work for existing translations. But I'll mark this one to be fixed.