Wiki use

For multiple languages we use the Polyglot extension. For instance the English version of the page on energy saving is https://embargo.energy/index.php/Saving, its German counterpart is https://embargo.energy/index.php/Saving/de, Ukrainian is https://embargo.energy/index.php/Saving/uk. That, is the default language is English. To create a new page or language just use "PageName/language" e.g. "Petitions/de" for "Petitions" in German. Then the language links appear automatically.
The goal is ease of use and editing, not perfection. E.g. it is OK if languages are mixed (e.g. a good combination is to start with English summary followed by some local language content)
It is suggested to maintain long link lists (even of mixed-language content) preferably in the English version. You can use | Labeled Section Transclusion to mark these relatively efficiently for just translating headings or other selected parts.
- E.g. there are named sections in the source code of the English https://embargo.energy/index.php/Saving, such for a Section "heating" as <section begin="heating"/> and <section end="heating"/>.
  - This section heating is then referred to by the German page https://embargo.energy/index.php/Saving/de as {{#lst:Saving|heating}}.
The navigation bar uses a customized script https://embargo.energy/index.php/MediaWiki:Common.js. To add a new navigation bar in a new language, drop mail to hb3141@gmail.com.

Wiki setup

Basics see Special:Version https://embargo.energy/index.php/Special:Version
Polyglot extension has been installed with fix in Skin.php as documented in https://www.mediawiki.org/wiki/Extension_talk:Polyglot