I have not used Qtranslate for some time but I am aware that on some forums others have mentioned issues.
The conversion to a responsive seems good to me, I may well have reverted to standard menu rather than responsive menu at lower screen resolution but that is a personal thing as I am not a great lover of the small responsive menus.
As to cost that is a lot more difficult not knowing exactly what is involved. Some people work for $10 an hour and some for $100 or more. The key thing is to get your site back working again at a price your are comfortable with.
It is also well worth getting a development version of your website created (easy to do in a sub directory on your hosting in a sub-domain with the Duplicator plugin) and then you can test Wordpress, plugin and theme updates to ensure they work properly before doing the updates to your live site.
The conversion to a responsive seems good to me, I may well have reverted to standard menu rather than responsive menu at lower screen resolution but that is a personal thing as I am not a great lover of the small responsive menus.
As to cost that is a lot more difficult not knowing exactly what is involved. Some people work for $10 an hour and some for $100 or more. The key thing is to get your site back working again at a price your are comfortable with.
It is also well worth getting a development version of your website created (easy to do in a sub directory on your hosting in a sub-domain with the Duplicator plugin) and then you can test Wordpress, plugin and theme updates to ensure they work properly before doing the updates to your live site.