joomla/joomla-platform — pull request #1734 by okonomiyaki3000 (2012-12-03 03:16:50+00:00)
Title: Use 'load_language' property as a flag to load the language files 

So that the constructor doesn't need to be overridden for this purpose.

It seems that almost all plugins override the constructor just to load language files. Now you will be able to simply set a property to true and they will be loaded automatically.