pluralization or something else

Humm...

singularize beleives that the singular form of "databases" is "databasis"

"Databases".singularize
=> "Databasis"

Without having tried this in a real rails app. You should be able to
add those lines into config/environment.rb

Inflector.inflections do |inflect|
  inflect.plural(/(database)$/i, '\1s')
  inflect.singular(/(database)s$/i, '\1')
end

It at least worked to add this inside script/console.