The best way to answer the first question is to visit the translatewiki.net. Change the language to your language, select the "vector" skin and add the advanced tool bar in in the preferences and check out the new functionality. And make some changes in your user page. When there is a need to improve on the localisation, please make the necessary changess . It should update your localisation straight away. We would like you to report each issue individually at http://meta.wikimedia.org/wiki/Usability_issues.