Fix: use klass.table_name instead of guessing from associated models (#847)

lib/annotate/annotate_models.rb

@@ -846,9 +846,7 @@ module AnnotateModels
       # Construct the foreign column name in the translations table
       # eg. Model: Car, foreign column name: car_id
       foreign_column_name = [
-        klass.translation_class.to_s
-             .gsub('::Translation', '').gsub('::', '_')
-             .downcase,
+        klass.table_name.to_s.singularize,
         '_id'
       ].join.to_sym
 

spec/lib/annotate/annotate_models_spec.rb

@@ -389,8 +389,8 @@ describe AnnotateModels do
 
             context 'with Globalize gem' do
               let :translation_klass do
-                double('Post::Translation',
-                       to_s: 'Post::Translation',
+                double('Folder::Post::Translation',
+                       to_s: 'Folder::Post::Translation',
                        columns: [
                          mock_column(:id, :integer, limit: 8),
                          mock_column(:post_id, :integer, limit: 8),