http://code.google.com/p/plugin-multitranslate/
(text from the project page)
A web2py app plugin that allows role based translations with merge,
partial file translation assignments, translation comments and other
features. It is currently functional, although it needs proper tests
(multiple environments and unit-testing), css fixes (for translated
highlighting) and layout design.
Working features
layout translation bar (links to the translation panel and shows
stats) Apply for translator access Manager panel:
Accept translators
Assign partial or total language translation to user
Merge multiple translations with translation precedence rule.
Edit / comment translation
Translator panel:
List translations
Edit translation
Comment translation
How to quickly add multitranslate to your project: In the app admin
interface:
install the multitranslate plugin
add "translation managers" and "translator" groups
add a "... manager" membership
Then, you can put the multitranslate link bar in a view (i.e.
layout.html) with this command:
{{=plugin_multitranslate()}}
web2py plugin multitranslate is released under the terms of AGPLv3
license