Docs: progress bars' animation now needs to be manually toggled

Refs #14409
bs-commonjs-generator.js: always use forward slashes in the require path.

Since `path.resolve` is using backslashes on Windows, we ended up with different files. Just replace those with forward slashes.
Added link to danish translation of docs
Merge pull request #14880 from danieljuhl/patch-2

Added link to danish translation of docs
Docs: progress bars' animation now needs to be manually toggled

Refs #14409
Merge pull request #14876 from twbs/fix-14875

bs-commonjs-generator.js: always use forward slashes in the require path.
Merge branch 'need-to-activate-animated-progressbar' of github.com:twbs/bootstrap into need-to-activate-animated-progressbar

Conflicts:
	docs/_includes/components/progress-bars.html
	docs/assets/js/src/application.js
grunt
Merge branch 'master' into need-to-activate-animated-progressbar
Removed unnecessary new lines that were inconsistent with current style.
Merge pull request #14881 from bhamodi/white-space-optimization

Removed unnecessary new lines that were inconsistent with the current formatting style.
Add "grunt-combine-media-queries".

This is temporary until clean-css supports this.

TODO: see why we end up with all those useless newlines...
Run `grunt`.