I have made these pages consistent for Bidi (Arabic, Hebrew), It should be OK but if there are problems, please let me know if something needs to be adjusted.

Indonesian is also a major language already completed for the 1st page. Japanese has at least the 1st page almost completed (except one section for voting rules), but there are other pages if you want, already linked from the lateral navbox.

Immediately the most urgent need would be for German, Dutch, Spanish, Italian, Hebrew, Arabic, Albanian, Turkish, Ukrainian, Russian, Persian, Urdu, Hindi, Malalayam, Tamil, Bengali, Chinese, Vietnamese, Korean.

Feel free to add other important European languages: Basque, Catalan, Icelandic, Croatian, Serbian, Croatian, Macedonian, Greek, Romanian, Danish, Swedish, Norwegian, Finnish, Slovenian, Czech, Slovakian, Polish, Hungarian, Estonian, Latvian, Lithuanian, Belarusian, Georgian, and some African languages such as Afrikaans, Swahili, Amharic and other Central Asian languages: Armenian, Azerbaijani, Uzbek, Tadjik, Turkmen, Nepalese, Tibetan, Mongolian, and may be some other Malay languages: Malaysian, Javanese, and Sundanese (even if Indonesian is there and may be read as a fallback).

Note that the templates are also translatable. The categories for these pages are already created (you may adjust their description) and will help you locate the missing pages if you want to translate more (including the navbox template), see https://meta.wikimedia.org/wiki/Category:Abstract_Wikipedia.

If you want help to create the categories for other languages and make the initial structure, just tell to this list. But if you translate the 1st page, don't forget to look at the bottom of the generated page: if you see a red link to the category, click it and it will allow instantly to create it within the translator tool (you are not required to translate the title, but then at least copy the English title, append a "/" and the language code, and it will be enough You may translate the description and the actual title that will be shown at top of pages, independantly of the actual page name (visible in the URL in the address bar of your browser, you DON'T need to rename pages).

You may also want to translate the official announcement of the project by the WMF (it is already translated in some languages of the urgent list above):

Note that for now the embedded images are still not translated in Commons (and it would require much more work for animations/videos). If you have created translations, let me know so that they can be referenced by some mean (this would require a more complex fallback mechanism as images don't have a consistant naming convention on Commons to get them translated, and there are other technical ways to make internationalizd images if we use the SVG format, which is faster to translate, provided the layout allows some change of text metrics to get a readable text with consistant font sizes for multiple texts).