DieOnSpam version 1.0 released
There is a newer version 2.0 over here.
The DieOnSpam plugin inspects the commited comment, and if the comment do not contain at least one non english character, it is assumed to be spam and is entirely ignored, and a message is returned to the user (in the rare case it is not a spam bot) which says that there has to be at least one non english character at the comment.
The 1.0 version introduce changes related to localization and personalization of the initial release. Now it is possible to specify the error message which is displayed, and the error can be formatted with HTML tags. The options window use to change this setting is fully localizable.
Installation instructions:
Under your plugins directory create a dieonspam directory and copy this file to it, then enter the options/dieonspam window in the blog administration and configure the error message to be displayed, and finally activate the plugin.
Creating a localization:
A pot file is available if you want to create a localized version for this plugin option window.