There is a growing number (well it's 3 and yesterday it was 2 :) ) of packages which extend mean.io for in place editing of strings, MEAN Stack administration and localization.
This is how you install mean and create your own package...
npm install -g meanio
mean init AppName
Installing an existing package
mean install mean-admin
mean install mean-tokens
Creating your own package
mean package yourPackageName
Your package will be created under /packages (3rd party packages like mean-admin and mean-tokens mentioned above get created under /node_modules.
To read more go to our blog post about packages in mean.io