misplaced.

#939102 by bleen and quicksketch: Accept attribute contains extensions instead of mimetypes (preventing Chrome from selecting files).

#939102 by bleen and quicksketch: Accept attribute contains extensions instead of mimetypes (preventing Chrome from selecting files).

#342336 by drewish: Revisit JS filtering so it works with spaces between extensions and uses a common error class name so other modules can use the same JS.

* Use an error string similar to what Drupal core is using.
* Passive JavaScript errors (in a red error box) instead of alert().