RTL for login screen.

props yoavf.
fixes #27784.

Built from https://develop.svn.wordpress.org/trunk@28096


git-svn-id: http://core.svn.wordpress.org/trunk@27927 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add missing 'Address' string for TinyMCE.

props pavelevap, ocean90.
fixes #27785.

Built from https://develop.svn.wordpress.org/trunk@28097


git-svn-id: http://core.svn.wordpress.org/trunk@27928 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix feature pointer border when using a color scheme.

props ryelle.
see #27778.

Built from https://develop.svn.wordpress.org/trunk@28098


git-svn-id: http://core.svn.wordpress.org/trunk@27929 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add context to string added in [28097].

props azaozz.
fixes #27785.

Built from https://develop.svn.wordpress.org/trunk@28099


git-svn-id: http://core.svn.wordpress.org/trunk@27930 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Account for a sidebar with no container to which classes can be added.

props ocean90.
fixes #27780.

Built from https://develop.svn.wordpress.org/trunk@28100


git-svn-id: http://core.svn.wordpress.org/trunk@27931 1a063a9b-81f0-0310-95a4-ce76da25c4cd