Template:Category

DO NOT INCLUDE {{languages}} template here

Template's doc

This template can be used for adding pages to language version category of specified category. Just use {{category|Blahblah}} in page Page_name/include (With exactly 1 slash. /include is after English name, not after /xy language code) to add all language versions of this page to Category:Blahblah, Category:Blahblah/es, Category:Blahblah/zh or another language of this category. Language is detected automatically, so every page is added to corresponding category.

User's comment

As I was too stupid to get how the things work with this template (before I tried and got corrected by DarthGandalf) here is a bit easier step-by-step instruction:

• If You have any article (let's say we have Example_Article), remove all categories in this Example_Article.
• Go to Example_Article/include page (if it doesn't exist, create it)
• Put there only categories to link Example_Article with in a form

<noinclude>{{ininclude}}</noinclude>
{{category|Category_name}}

• When You go back to Example_Article You should see working categories. Each /localized version of Example_Article like

Example_Article/de
Example_Article/pl
Example_Article/phl
and so on...

will get automatically category from english version with /lang suffix, as mentioned above.

Note

If you wonder, how the hell it works... check last line of Template:Languages's source :)