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    <p>First of all, Zope already has gettext-compatible i18n packages available for you, in the form of <a href="http://pypi.python.org/pypi/zope.i18n" rel="nofollow"><code>zope.i18n</code></a>. This is already part of Zope itself, no need to install it separately.</p> <p>Secondly, don't muck about with <code>__builtin__</code>; simply <em>import</em> the message factory into a module and name it <code>_</code>.</p> <p>In your Zope Product <code>__init__.py</code> you add a message factory for this:</p> <pre><code>from zope.i18nmessageid import MessageFactory from AccessControl import ModuleSecurityInfo YourDomainMessageFactory = MessageFactory('your.domain') ModuleSecurityInfo('your.packagename').declarePublic('YourDomainMessageFactory') </code></pre> <p>Now you have a message id factory that can be imported into any of your project python files, <em>including</em> restricted files:</p> <pre><code>from your.packagename import YourDomainMessageFactory as _ message = _('Your message to be translated') </code></pre> <p>Note how we still use <code>_</code> as the local name in the code.</p> <p>You register your message catalogs with a short amount of ZCML:</p> <pre class="lang-xml prettyprint-override"><code>&lt;configure xmlns:i18n="http://namespaces.zope.org/i18n"&gt; &lt;i18n:registerTranslations directory="locales" /&gt; &lt;/configure&gt; </code></pre> <p>where <code>locales</code> is a subdirectory of the directory the <code>configure.zcml</code> file lives. <code>zope.i18n</code> expects to find <code>&lt;REGION&gt;/LC_MESSAGES/yourdomain.mo</code> and optionally, <code>&lt;REGION&gt;/LC_MESSAGES/yourdomain.po</code> files in the registered directory; <code>.po</code> files are automatically compiled into <code>.mo</code> files for you as needed.</p> <p>ZPT page templates use <code>zope.i18n</code> message catalogs by default, see <a href="http://wiki.zope.org/zope3/ZPTInternationalizationSupport" rel="nofollow">ZPT i18n support</a>.</p> <p>If you need to translate something manually, use the <code>zope.i18n.translate</code> function:</p> <pre><code>from zope.i18n import translate message = _('Your message to be translated') print translate(message, target_language='de') </code></pre> <p>Most of the <a href="http://plone.org/documentation/manual/developer-manual/internationalization-i18n-and-localization-l10n" rel="nofollow">Plone i18n manual</a> applies to generic Zope applications.</p> <p>If you absolutely <em>have</em> to be able to poke things into <code>__builtins__</code>, then by all means directly manipulate <code>RestrictedPython.Guards.safe_builtins</code>; it's a dictionary:</p> <pre><code>from RestrictedPython.Guards import safe_builtins safe_builtins['_'] = t.gettext </code></pre>
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    1. COThanks for the detailed answer! Unfortunately I have problems getting it working. First, I had already tried setting the safe_builtins exactly as you suggest, but it does not make any difference: in web-based Python Scripts I get the NameError. Do they use different \__builtins\__? Second, while gettext.translation works, myDomainMessageFactory does not, it returns the string to be translated. And how can I tell it what language I want it to be translated in?
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    2. CO@Rastaf: Use an explicit `translate(message)` call to have message ids translated. Normally, we use these in views and as they end up in a ZPT template, that translates these for us. I'm not certain about `safe_builtins`, never use it myself. :-)
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    3. COIt took me some time, but now I got the i18nmessageid working. Thanks, that's exactly what I need, although I didn't realize it right away ;)
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