Support right-to-left text direction

Created by: melgebali

Hi, thanks for the awesome gem! I am using I18n with administrate and the website is working in Arabic and English. Since Arabic needs to be rendered right-to-left I use the html tag dir option which works fine for the most part. The problem is that the columns are rendered by the gem are still left-to-right, so the titles are on the left and the data on the right although the navigation dashboard is correctly on the right. Am I missing something that can be easily done through the gem or do I have to make edits in the views? Thanks!