Languages of the Ottoman Empire
The language of the court and government of the Ottoman Empire was Ottoman Turkish, but many other languages were in contemporary use in parts of the empire. Although the minorities of the Ottoman Empire were free to use their language amongst themselves, if they needed to communicate with the government they had to use Ottoman Turkish.
Lala (title)
The practice of lala was even older than the Ottoman Empire. During the Seljuk Empire, the experienced statesmen accompanying the princes were called Atabeg or Atabey ( a Turkish composite title meaning ancestor-lord). However, Seljuk Empire was highly feudalistic and atabeys frequently used their power for separatist policies whenever they felt a weakness in the central authority. (like Eldiguzids in Azerbaijan and Zengids) 
The Ottoman Empire, on the other hand was more centralist and almost no lala tried to follow a separatist policy.