Resolves #10923

Rebased from #10930
add note about third-party JS, CDNs, and HTTPS
Merge pull request #11137 from twbs/explain-https

add note about third-party JS, CDNs, and HTTPS
Update translation URL
Merge pull request #11141 from vincentchan/master

Update translation sites URL
fix #11144
FIx invalid element selector

`kbd` (keyboard) is right, not `kdb`. :P
Merge pull request #11150 from ZDroid/patch-1

FIx invalid element selector
add explicit copyright header to docs CSS & JS files; fixes #11112
even shorter banner; remove space between slash and period
Merge branch 'fix-11112'
copy change, add to buttons anchor section
Merge branch 'master' into navbar-button-docs
Merge pull request #11096 from twbs/navbar-button-docs

Resolves #10923