[Zabbix-translators] changed string in turkish translation

[Rihards <rih...@za...>]

heya. trying to sync translations, there was one error for turkish
translation. i sort of fixed it, but it would be great to review ;
-thanks :)

https://www.zabbix.org/pootle/tr/Zabbix-2.2/translate.html#unit=354522
-- 
 Rihards