enable/disable plugins by config option

config/app_config.yml.SAMPLE

@@ -67,6 +67,12 @@ default: &defaults
   # Members of a user's groups and administrators can still see full names.
   use_nick: false
 
+  # Most plugins can be enabled/disabled here as well. Messages and wiki are enabled
+  # by default and need to be set to false to disable. Most other plugins needs to
+  # be enabled before they do anything.
+  #use_wiki: true
+  #use_messages: true
+
   # Base font size for generated PDF documents
   #pdf_font_size: 12
   # Page size for generated PDF documents
@@ -86,8 +92,8 @@ default: &defaults
   notification:
     error_recipients:
       - admin@foodcoop.test
-    sender_address: "\"FoodSoft Error\" <foodsoft@foodcoop.test>"
-    email_prefix: "[FoodSoft]"
+    sender_address: "\"Foodsoft Error\" <foodsoft@foodcoop.test>"
+    email_prefix: "[Foodsoft]"
 
   # Access to sharedLists, the external article-database
   shared_lists:

config/locales/en.yml

@@ -288,6 +288,7 @@ en:
       error_denied: You are not allowed to view the requested page. If you think you should, ask an administrator to give you appropriate permissions. If you have access to multiple user accounts, you might want to %{sign_in}.
       error_denied_sign_in: sign in as another user
       error_members_only: This action is only available to members of the group!
+      error_plugin_disabled: This feature is currently disabled.
       error_token: Access denied (invalid token)!
   article_categories:
     create:

config/locales/nl.yml

@@ -286,6 +286,7 @@ nl:
       error_denied: Je hebt geen toegang tot de gevraagde pagina. Als je denkt dat je dat wel zou moeten hebben, vraag dan een beheerder je die rechten te geven. Als je meerdere accounts hebt, wil je mogelijk %{sign_in}.
       error_denied_sign_in: inloggen als een andere gebruiker
       error_members_only: Deze actie is alleen beschikbaar voor leden van de groep!
+      error_plugin_disabled: Deze actie is momenteel uitgeschakeld.
       error_token: Geen toegang (ongeldig token)!
   article_categories:
     create: