This very basic tool does nothing else than creating and redirecting you to the URL of your choice by filling in language code, Wiki project, namespace and page name in English. Most wikis will e.g. redirect "User:" to the localized namespace in the given language.
Note, that wikis in some languages do not redirect the English namespace to the namespace of their language. Be prepared that in such case the new window will land in an empty page.
This tool has proven its usefulness in conjunction with global user pages. One can directly access the own user page on virtually any language version of any wiki project, given that the wiki supports a redirect.
Let me know if you use it in other situations.
Written by [[User:Pod-o-mart]]