Remove extra space from a string.

props pavelevap.
fixes #29752.
Built from https://develop.svn.wordpress.org/trunk@29767


git-svn-id: http://core.svn.wordpress.org/trunk@29539 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Merge two similar strings.

props pavelevap.
fixes #29751.
Built from https://develop.svn.wordpress.org/trunk@29768


git-svn-id: http://core.svn.wordpress.org/trunk@29540 1a063a9b-81f0-0310-95a4-ce76da25c4cd