Copy the two files inside /custom folder of your Plone instance and run "/duplicarCarpeta" inside the context of the folder you want to translate. The second script will run and copy all the original contents to the linked translated folders and will set the setLanguage to the destination language.

duplicarCarpeta.py

request = container.REQUEST

idiomactual = context.REQUEST.other['LANGUAGE']

from Products.CMFCore.utils import getToolByName
urltool = getToolByName(context, 'portal_url')

if context.restrictedTraverse('@@plone').isStructuralFolder():
    path_to_translate = '/'.join(context.getPhysicalPath())
else:
    path_to_translate = '/'.join(context.aq_inner.aq_parent.getPhysicalPath())

print "Estás apunto de copiar la carpeta y sus contenidos: "
print "<br/>(" + str(context.getLanguage()) + ") -- " + str(context.absolute_url())

original_language = str(context.getLanguage())

translations = context.aq_parent.getTranslations()

print "<br/><br/>A la(s) carpeta(s):"
for translation in translations:
    if (translation != original_language):
        print "<br/>(" + str(translation) + ") -- " + str(translations[translation][0].absolute_url())

print "<br/><br/>Nota: Los elementos pasarán a tener configurado el nuevo idioma"
print "<br/><a href='duplicarCarpetaAhora'>Copiar ahora</a>"

return printed

duplicarCarpetaAhora.py

request = container.REQUEST

idiomactual = context.REQUEST.other['LANGUAGE']

from Products.CMFCore.utils import getToolByName
urltool = getToolByName(context, 'portal_url')

# Copy folder
object_to_copy = context.aq_parent.manage_copyObjects([context.id])
print "Copiant contingut de: ", str(context.absolute_url())

# Destination path
translations = context.aq_parent.getTranslations()
original_language = str(context.getLanguage())

for translation in translations:
    if (translation != original_language):
        translations[translation][0].manage_pasteObjects(object_to_copy)
        print "Contingut copiat a: ", str(translations[translation][0].aq_parent.absolute_url()), "... OK"

# Change language
for translation in translations:
    if (translation != original_language):
        path_to_translate = '/'.join(translations[translation][0].getPhysicalPath())
        results = context.portal_catalog({'path':{'query':path_to_translate,'level':0,'depth':99}})
        for result in results:
            result.getObject().setLanguage(str(translation))
            print "Idioma modificat al objecte: ", str(result.getObject().absolute_url())
  
return printed