Contrarily to what we translators may think ;-), things should not always be translated. That is why Wikispelling was created, in order to avoid misspelling of proper nouns and local names. Wikispelling is a trans-wiki and multilingual project. Please help by checking the translation in your own language of commit messages at Wikispelling. And feel free to participate!
Languages have different rules regarding capitalization. For example, in English, the month names and most words of work titles are always capitalized, but in French they are not. Most Wiktionary projects differentiate nowadays between capitalized letters and small letters. Wiktionary needs to know what rules each language has regarding capitalization. Please help to complete the table of Capitalization!
An initiative to coordinate between various Wikisource language wikis in the gathering of old translations and the creation of new ones for source texts that have never been translated or have only copyrighted translations et cetera. Hosted on English Wikisource.
Information about localisation for both translators and developers can be found on the localisation page on MediaWiki.org. The information may be outdated.