...

Example:

<p i18n:translate="" i18n:target="string:en"> label_search </p>

It doesn't work. I cannot specify the target language.

I am in Zope 2.9.4. Just a guess: Don't you need to specify a domain as well? Ok, I tested it as well and it didn't work either. I just found it is a bug and here is a patch: http://www.zope.org/Collectors/Zope/1114

However be careful when using patches, specially when working with unicode data. You have to make sure they don't concatenate normal strings and unicode: This is really difficult to debug. I think that the "i18n:target" directive is only useful you want to show a text in a zpt which must be always rendered in the same language (ie: some governmental entities shows first an English version of a official document, then immediately above there is a version let's say in spanish). But if what you want is to change the language in the whole zpt, then implementing your IUserPreferredLanguages would do the trick. Regards Josef