Language issue

Hi everyone, thank you for the add.
I’d be very grateful if you could help me with the following issue. I’m experiencing a blank page problem with one of my pages.
My website is in two languages (English and Russian), it’s not very useful, I’d rather go back to one language, I ended up having the same text in both versions (if you know an easy way to do it without damaging the site, please share)
My main sales page went blank when it contains /en/ in it.

? The general one works fine: https://russianpodcast.eu/about-russian-podcast-club

? The Russian one works too: https://russianpodcast.eu/ru/about-russian-podcast-club

? The English one doesn’t work: https://russianpodcast.eu/en/about-russian-podcast-club

? The plugin I’ve installed most recently is Wordfence. I also have a payment plugin, it was recently updated.

? To have two languages, I use qTranslate, apparently it hasn’t been updated for a while. May that be a problem?

Thank you so much in advance for your help.

The page I need help with: [log in to see the link]