Corrected a small error in the documentation
Added links to Ukrainian translation website
Merge pull request #11718 from KostyaTretyak/once

Added link to Ukrainian translation website (in about.html)
Added the removal of tab-content and tab-pane in the migration guide
Merge branch 'master' of https://github.com/twbs/bootstrap into edit
Fixed another small error
This is error?
Merge pull request #11733 from KostyaTretyak/edit

Fixed some errors in the documentation
Merge pull request #11723 from stof/patch-1

Added the removal of tab-content and tab-pane in the migration guide