To upload your changes, you need an upload account. Write at support@jdownloader.org to get an account.
Write at support@jdownloader.org. We create a dummy translation for you which can be opened in lfe.
After Sourceupdate and Sourceanalyser has finished, you can load a language.
Remove all orange entries (outdated) Translate all red entries (untranslated) Green entries should be ok.
Then save your changes. While saving, jd may ask you to select between two different translations. DO THIS!