[Bug] English version is not preserved on redirection from Stripe after successful donation and error is shown when try to switch back to EN

[DanielTakev]

Which area(s) of Podkrepi.bg are affected? (leave empty if unsure)

Donations

Describe the Bug

This bug has two sides which are probably connected. I'm not sure, so I'm logging it as one issue.

1. When we start donating from EN version, fill in all the data in Stripe checkout page and make a successful payment, then we are redirected to the Donation page, but the language version is not preserved, we're redirected to the BG version.
2. At that moment, if we try to change the version to EN in the Donation page -> Step Payment, then we get an error: Unfortunately there was a problem! and the following warnings into the browser console:

• Fetching session returned null.
• XHR without token!!!
  (Screenshot attached externally)
  NOTE: This is reproduced during testing. It is not tried on production with a real donation.

To Reproduce

1. Make a donation while using the EN version
2. Fill all fields in Stripe checkout page and pay successfully
3. Check the redirection after the donation

Actual result: The user is redirected to the BG version instead of the EN version. The user gets an error Unfortunately there was a problem! when trying to switch back to EN version.

• Screenshots here: https://drive.google.com/drive/folders/1Qo2mV7BdfD5C8eB7Wrgi_c-x2wCTxRtW?usp=share_link

Expected Behavior

The language version is preserved after the payment. The user should not see any errors.

Which browser are you using? (if relevant)

Chrome 108.0.5359.99