[wp-trac] [WordPress Trac] #65374: Clarify the "invalid_filetype" upload error message

[WordPress Trac]

#65374: Clarify the "invalid_filetype" upload error message
-------------------------+-----------------------------
 Reporter:  thorr19      |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  General      |    Version:  trunk
 Severity:  minor        |   Keywords:
  Focuses:               |
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 The `invalid_filetype` error string in `wp_default_scripts()`
   (`src/wp-includes/script-loader.php`) currently reads:

     "This file cannot be processed by the web server."

   This implies a server fault when the actual cause is that
   WordPress does not accept the file's MIME type. The wording
   is also inconsistent with neighboring strings in the same
   `$uploader_l10n` array, which all explain the cause and
   suggest an action:

   - `zero_byte_file`: "This file is empty. Please try another."
   - `not_an_image`:   "This file is not an image. Please try another."

   Proposed change:

     "This file type is not supported. Please try another."

   This pattern-matches the surrounding strings, removes the
   misleading "web server" framing, and tells the user what to
   do next.

   See also: #61361, which addressed the analogous image-specific
   wording (`noneditable_image`) for the same reason. The
   `invalid_filetype` message was not touched in that ticket but
   suffers the same vagueness.

   A PR with this change is in flight on GitHub and will be linked
   once opened.

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Ticket URL: <https://core.trac.wordpress.org/ticket/65374>
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