WooCommerce Help Scout 3.9.5

* PLUGINS-1533 - Fix Notice errors in the plugin in 3.4 version

* PLUGINS-1453 - Fix fatal error which is causing subscriptions fail
* PLUGINS-1396 - Fix Notice errors
* PLUGINS-645 - Support other languages
* PLUGINS-1518 - Language fixes

* PLUGINS-997 - Fix various notice errors.
* PLUGINS-207 - Validation errors.
* PLUGINS-1241 - Add tab for ticket.
* PLUGINS-1192 - Add a filter to hide helpscout in customer order page.
* PLUGINS-381 - Cancel WooCommerce Subscriptions
* PLUGINS-379 - Refund WooCommerce Charges Inside Help Scout
* PLUGINS-1242 - Show conversation history on reply.
* PLUGINS-1293 - Code improvement.