FIXES:

* Inflections für Thema/Themen etc.
  * Korrigierte Views

app/models/thema.rb~

@@ -1,5 +1,11 @@
 class Thema < ActiveRecord::Base
   attr_accessible :text, :title
   has_many :fragen
+  has_many :attachments
   belongs_to :themengruppe
+  
+  validates :themengruppe, :presence => true
+  validates :title, :presence => true
+
+  translates :title,:text, :versioning =>true, :fallbacks_for_empty_translations => true
 end