Adding a page to a non-English channel redirects to the English channel

When a new page is added to a non-English channel, the channel manager redirects to the English channel and shows a 'not found' page.

Steps to reproduce:
1. login to the GoGreen CMS
2. navigate to the Dutch channel
3. click 'Edit Channel'
4. click 'Pages'
5. click 'Add new page'
6. enter a name and URL, and click 'Create page'

Expected: the new page is shown in the Dutch channel
Actual: a 'Not found' page is shown in the English channel

The new page is added correctly to the Dutch channel, but the channel manager just does not show it after creating it.