Also set system locale with the Java API. Closes #978

app/src/main/java/eu/kanade/tachiyomi/util/LocaleHelper.kt

@@ -89,6 +89,8 @@ object LocaleHelper {
         val newConfig = updateConfigLocale(config, currentLocale!!)
         val resources = app.resources
         resources.updateConfiguration(newConfig, resources.displayMetrics)
+
+        Locale.setDefault(currentLocale)
     }
 
     /**