In `sanitize_file_name()`, replace a UTF-8-encoded Unicode representation of a non-breaking space (`\u00a0` / `\xc2\xa`) with an old-fashioned space: ` `.

Fixes #27281.



git-svn-id: https://develop.svn.wordpress.org/trunk@27617 602fd350-edb4-49c9-b593-d223f7449a82
TinyMCE strings: Merge, remove, reorganize, restore, clarify.

see #27453, #24067.


git-svn-id: https://develop.svn.wordpress.org/trunk@27618 602fd350-edb4-49c9-b593-d223f7449a82