add configuration for default language

config/app_config.yml.SAMPLE

@@ -34,6 +34,13 @@ default: &defaults
   # documentation URL for the apples&pears work system
   applepear_url: https://github.com/foodcoops/foodsoft/wiki/%C3%84pfel-u.-Birnen
 
+  # Default language
+  #default_locale: en
+  # By default, foodsoft takes the language from the webbrowser/operating system.
+  # In case you really want foodsoft in a certain language by default, set this to true.
+  # When members are logged in, the language from their profile settings is still used.
+  #ignore_browser_locale: false
+
   # price markup in percent
   price_markup: 2.0
 

lib/foodsoft/controller_extensions.rb

@@ -25,13 +25,14 @@ module Foodsoft
       end
 
       def default_language
-        ::I18n.default_locale
+        FoodsoftConfig[:default_locale] or ::I18n.default_locale
       end
 
       protected
 
       def select_language_according_to_priority
-        language = explicitly_requested_language || session_language || user_settings_language || browser_language
+        language = explicitly_requested_language || session_language || user_settings_language
+        language ||= browser_language unless FoodsoftConfig[:ignore_browser_locale]
         language.to_sym unless language.blank?
       end