Created attachment 4055 xfce4-netload-plugin-add-mnemonics.patch This patch adds mnemonics to all widgets in the configuration dialog.
Created attachment 4056 update-msgids-in-po-files.sh Patch 4055 makes it necessary to update the msgids in the translation files. While there might be a better way to do this that I don't know of, here's the small bash script I used which updates exactly the msgids that have been changed by the patch.
Comment on attachment 4056 update-msgids-in-po-files.sh The PO fix will not be necessary and actually breaks translation, indeed translated files will all miss the mnemonics. Translators will have to update them through Transifex.
Changes are in git master. a80dde3..11313a0