multiple questions to understand and solve

hi first of all thanks for the work you have done, secondary appreciate the add-ons folder.

1- when an order is placed the order page is not showing up instead it gives out the hello world post.

2- when using qtranslate items from the chart are delated it shows up the quick tags [:en] of the 2 different languages and the corresponding content i am using for testing instead of the only language required content .

3- pushing the back button gives out some problem with the order if they have been changed meanwhile but i will keep updated about this if necessary.

4-which is the best framework/ theme compatible? just in case to avoid conflicts

thanks

https://www.ads-software.com/plugins/wppizza/