It seems that one template from Products.Five (manage_interfaces) has a bad i18n markup, making interfaces name translatable. i18n domain is not defined, therefore the global one is used.
I want to change the i18n domain for that page, but I don't know how to do that from my packages. The page is registered using browser:page Five directive
<browser:page
for="*"
name="manage_interfaces"
template="manage_interfaces.pt"
class="Products.Five.utilities.browser.marker.EditView"
permission="zope2.ManageProperties"
/>
I tried http://www.mesimian.com/zope-changing-i18n-domain-for-any-view/ but that doesn't work.
First of all, file a bug report; the upstream developers would probably like to know about this.
Use z3c.jbot to override the template in your own package. Create a templates subdirectory, register it and put a file named Products.Five.utilities.browser.manage_interfaces.pt in that subdirectory. That file will be used to replace the original template.
Registration of the directory with z3c.jbot is simple, read the instructions on the PyPI page.