with locale IT in the control panel (see screenshot attached) nothing works
are just the button names different? Does it work with default locale as in the main search is powered by sphinx?
for greater understanding i've performed for the following test (with the searched running):
so the difference is non only cosmetic but with my locale (IT) control panel wont works
All customer facing text has its associated translation in the plugin's locale folder for EN-CA. If you want to change it to Italian, you should be able to put in your translations in a separate file. The control panel has all of its text in English with no current support for translations. When you change the locale to something else, like Italian, the button's value is also being changed to "Action". Because of this, I suspect that the values in POST and GET are being populated with the generic "Action" text instead of expected values like "IndexMain" and "Shutdown". I'm not sure why this Vanilla does this though....
I'll see if I can get a fix in the next version, but for now I would enable sphinx in EN-CA and then switch locales since sphinx should run on its own until you shut it off.