fix forgotten i18n string (affects foodcoops#137)

app/views/stock_takings/_stock_change.html.haml

@@ -1,7 +1,8 @@
 %p
   = simple_fields_for "stock_taking[stock_change_attributes][]", stock_change do |form|
     = form.hidden_field :stock_article_id
-    = "Menge (#{stock_change.stock_article.quantity_available})"
+    = t '.amount'
+    (#{stock_change.stock_article.quantity_available})
     = form.text_field :quantity, :size => 5, :autocomplete => 'off'
     %span{:data => {:toggle => :tooltip, :title => render(:partial => 'shared/article_price_info', :locals => {:article => stock_change.stock_article})}}
       %b= stock_change.stock_article.name

config/locales/de.yml

@@ -1392,6 +1392,7 @@ de:
       new_inventory: Neue Inventur anlegen
       title: Inventurübersicht
     new:
+      amount: Menge
       create: anlegen
       stock_articles: Lagerartikel
       temp_inventory: vorläufigen Lagerbestand

config/locales/en.yml

@@ -1398,6 +1398,7 @@ en:
       new_inventory: Create new inventory
       title: Inventory overview
     new:
+      amount: Amount
       create: create
       stock_articles: Stock articles
       temp_inventory: temporary inventory