How can I redirect multiple pages at once without an app?

[PureTime]

Is there simply no way to redirect multiple pages at once besides paying for an app?

I unpublished my second language, so alle pages on /en/* should redirect to my main site now.

I tried many things with javascript executed in the theme.liquid but none of them works.

I feel quite stupid if I have to pay for an app to do this one-time-job.