Fix feature pointer border when using a color scheme.

props ryelle.
see #27778.


git-svn-id: https://develop.svn.wordpress.org/trunk@28098 602fd350-edb4-49c9-b593-d223f7449a82
Add context to string added in [28097].

props azaozz.
fixes #27785.


git-svn-id: https://develop.svn.wordpress.org/trunk@28099 602fd350-edb4-49c9-b593-d223f7449a82