Can't change language of CKEditor from config-field.js

[Zeka]

Hi. 

I have CKEditor field with the name 'wysiwyg'

In config.js and config-wysiwyg.js I have such code

CKEDITOR.editorConfig = function( config ) {
	// Define changes to default configuration here. For example:
	config.language = 'ru';
	// config.uiColor = '#AADC6E';
};

File config-wysiwyg.js get loaded on the page edit screen, but the language is not changed. But if I put 'language:ru' to 'Custom Config Options' on the field edit page everything works as expected. What is strange, that is if I try to change UI color via config-wysiwyg.js - color get changed.

CKEDITOR.editorConfig = function( config ) {
	// Define changes to default configuration here. For example:
	config.language = 'ru';
	config.uiColor = '#AADC6E';
};

So it looks live there is some special case with language property. 

Did somebody have such behavior? I want to have all field-relative settings in the one file to not get a mess.