I try to get string translations working in Pyramid with ZPT templates. I followed the Pyramid guide on internationalization and localization, i.e. http://docs.pylonsproject.org/projects/pyramid/en/latest/narr/i18n.html#chameleon-template-support-for-translation-strings.
However, when I add the line
<span>${some_translation_string}</span>
to my .pt template file I just get an assertion message from waitress:
NameError: some_translation_string
When I translate the string some_translation_string outside the ZPT templates (i.e. in the Python code of the view) it translates correctly. Thus, I think to have a valid compiled message catalog in place (though created manually due to missing Python3 support of babel/lingua).
I guess I misunderstand the way to insert localized strings in ZPT templates in general. It probably cannot be the same as for referencing variables?
As I understand now, translations within the ZPT template should look like this:
<span i18n:translate="">some_translation_string</h1>
If you omit the string identifier in i18n:translate the string itself is used for this.
Also you must add add the domain name in the template header, e.g.:
<html lang="en"
xmlns:tal="http://xml.zope.org/namespaces/tal"
xmlns:metal="http://xml.zope.org/namespaces/metal"
xmlns:i18n="http://xml.zope.org/namespaces/i18n"
i18n:domain="my_domain">
This information seems to be missing in the referenced Pyramid documentation.