popup_theme_normal: Completely hide popup until one is initialized

closes #809
spin: english version
Merge pull request #603 from bem/issues/579@v2

spin: english version. Close #579
menu-item: English description
Merge pull request #714 from bem/issues/#682@v2

menu-item: English description
checkbox-group block english description
Merge pull request #692 from bem/issues/#640@v2

checkbox-group block english description
menu block english description
Merge pull request #683 from bem/issues/#664@v2

menu block english description
link block english description
Merge pull request #676 from bem/issues/#632@v2

link block english description
popup block english description
Merge pull request #634 from bem/issues/#600@v2

popup block english description
dropdown block english description
Merge pull request #610 from bem/issues/#572@v2

dropdown: block english description
attach: english version
Merge pull request #591 from bem/issues/571@v2

attach: english version. Close #571
control: english version
Merge pull request #593 from bem/issues/574@v2

control: english version. Close #574
checkbox: english version