[silva-dev] i18n-translation depending on document language

[Samuel Schluep]

Hi altogether

> Is it possible to translate specific strings by the help of the Five 
> machinery depending on the document's language setting. The standard 
> i18n procedure for Silva is targeted mainly at the translation of the 
> SMI. In my case, I would like to translate the label of a forms button 
> in a Silva extension which shows up on public pages. In this case it 
> makes more sense to set the language to the document's language rather 
> than the user preferences (set in either Silva's user settings or the 
> user's browser setting). This translation might be performed in a 
> Python Script.

I have just found a solution on my own. In case someone is interested, 
here it is:

In my helpers.py module I created the following function (the functions 
in helpers.py are enabled to be used in Python Scripts):

def translate_to_doc_lang(msgid, model):
    """Translate a messageid to the language of the document

    Translates a string to the language of the Silva object being rendered
    using the dlcms domain.
    Arguments:
    msgid -- a MessageId object containing the string and the domain
    model -- the Silva object being rendered
    """
    from zope.i18n import translate
    # get language setting of Silva object being rendered
    try:
        binding = model.service_metadata.getMetadata(model)
        lang = binding.get('silva-extra', 'language')
    except:
        # No binding found..
        lang = 'en'
    lang = lang.lower()  # silva-extra uses upper-case codes which do 
not translate
    return translate(msgid, target_language=lang)


In the script I then use something like the following (note I use this 
in the SilvaDLCMS extension product):

from Products.SilvaDLCMS.i18n import translate as _
from Products.SilvaDLCMS.helpers import translate_to_doc_lang
model = context.REQUEST.model
return '<input type="button" onClick="doSomething(this.form)" value=" ' +  \
           translate_to_doc_lang(_('press the button'), model) + \
           '" />'


Et voilà, the message is shown in the language specified by the language 
metadata setting, provided there is a translation somewhere.

Regards
Sam