As far as I understood you should create one page for each language where the slug is the same. Then you can use the filter {{ page | in_locale: 'your-language-id' }} .

Sorry, I forgot to explain that your page structure should reflect the language. That is, /page/en/blog and /page/de/blog, for example.

Hi! Thank you for your reply.
I made a quick test and it seems not to work.

I made 5 pages:
help
en
en/help
de
de/help

content of page 'de/help':
<h1>Hilfe</h1>
<p>Dies ist die deutsche Hilfeseite</p>

content of page 'en/help':
<h1>Help</h1>
<p>This is the english help page. </p>

content of page 'help' includes language selection:

{% assign p = page | in_locale: 'de' %}
users.current.language: {{ users.current.language }}
{{ p.content }}

calling /pages/help
renders the page 'de/help', so it works as expected.

Now I wanted to change the language and edited content of page 'help' to select 'en' instead of 'de':

{% assign p = page | in_locale: 'en' %}
users.current.language: {{ users.current.language }}
{{ p.content }}

calling /pages/help renders:
users.current.language: en {% assign p = page | in_locale: 'en' %} users.current.language: {{ users.current.language }} {{ p.content }}

So, the localized de page is found, but the localized en page not. Any ideas?

If your default language of Redmine is equal to the language given in 'in_locale:' then it won't work. My workaround was to change the default language in Redmine.

Hello. On the mentioned points, please contact our support team at support@redmineup.com. Thanks.