With Poedit you can edit wsi.po that is located in the root of the plugin. Once translated save it into the languages folder and rename both .po and .mo to the translated language appeding wsi- to it.
For example if you translated the plugin into spanish, save it as wsi-es_ES.mo and wsi-es_ES.po and put that files inside the language folder.
Please contribute with the plugin and send us your translation files