Improve i18n of Akismet's new widget

[dimadin]

As reported on Twitter, attached patch improves i18n of a new widget that was broken.

Note that I got error unrelated to above which was fixed for me when I changed to

add_action( 'wp_head', array( $this, 'css' ) );

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'Akismet_New_Widget::css' was given in /wp-includes/plugin.php on line 405

[josephscott]

In [532382]:

Translation improvements for the new widget code, props dimadin

Also mention the new widget code in the change log.

Fixes #1511

[josephscott]

I wasn't able to reproduce this the add_action() issue you mentioned. I suspect that this is a difference in PHP versions. I went ahead and committed your version since it worked fine for me as well.