@Kixo , @PetarT 
In backend site with version 2.5, i think we don't need loading bootstrap into backend site. if our component need bootstrap framework just call it only into that component. bootstrap need both js file and css file to work correct, with css file of boostrap, it will make all template in admin site works wrong: both plugin form, module form, all component (please see attach image: bootstraps2.png ). how can i fix this? :). i don't want fix css file of boostrap. :)