My name is Igor, I'm a creator of RailsDB gem, and I just saw link to this page from where are people coming. I want to thank you for your feedback. Please use gem, soon it's planned to add I18n support so you anybody can help with translations. BTW yesterday was a new gem release with cool features:
Please check them https://github.com/igorkasyanchuk/rails_db Igor
Rails DB finally reached version 1.0, one last thing which I wanted to finish before release was - creating records. So now Rails DB is very similar to ActiveAdmin for example or similar gems + has own set of cool features.
Please give it a try https://github.com/igorkasyanchuk/rails_db