“Save” button not translated

The “Save” button in the plugin can’t be translated, because it has wrong domain.
It’s using “spnotes” instead of “simple-post-notes”.

https://plugins.trac.wordpress.org/browser/simple-post-notes/tags/1.7.1/simple-post-notes.php#L398