Fixes 12738

BS3 commits: b4d66b7f6b8ca49fbf45fccf445910d607969946
Fixes 12759

BS3 commits: a15c24410be8b94671dcfc3b154e0034a3aaf35f
fix grammar in comment in forms.less

BS3 commits: b1f71e5292017aca978fabb74d256989e1eeea07
replace .visible-{size} with .visible-{size}-{display} ; fixes 8869. Copy change

BS3 commits: bdd7651e323a93a4e3d207463451dd374b0a70fa,
76883ff9b478935369613db5b59bd07b615a8140
Replace some images on the Carousel example with some base64 encoded 1x1 gifs

BS3 commits: 309ef72ef4f4096a88ecae60fe38db689047bc9c
Use `outline: 0` consistently

BS3 commits: c4bc0d2311fe6eb275ec392d7212de15b4f449a4
Add missing customizer comment

BS3 commits: 6234ba561a5d6549b68825416905d4fdbabc695e
Fixes 12738. Fixes 12759. replace .visible-{size} with .visible-{size}-{display} ; fixes 8869. Copy change. grunt. grunt

BS3 commits: b4d66b7f6b8ca49fbf45fccf445910d607969946,
a15c24410be8b94671dcfc3b154e0034a3aaf35f,
bdd7651e323a93a4e3d207463451dd374b0a70fa,
76883ff9b478935369613db5b59bd07b615a8140,
30deb5697c08c885b5b7fedac6c40c13d7aa034b,
564b79ca875b2deb88adfc90e08fe4015b8001ce