finish layouts i18n, use help url from config, use html language from locale

app/views/layouts/application.html.haml

@@ -1,19 +1,19 @@
 = render layout: 'layouts/header' do
   .logo
-    <span>food</span>soft
+    = t('layouts.logo').html_safe
   %ul.nav.nav-pills.pull-right
     %li.dropdown
       %a.dropdown-toggle(data-toggle="dropdown" href="#")
         = current_user.nick
         %b.caret
       %ul.dropdown-menu
-        %li= link_to "Profil bearbeiten", my_profile_path
-        %li= link_to "Meine Bestellgruppe", my_ordergroup_path
-        %li= link_to "Abmelden", logout_path
+        %li= link_to t('.profile'), my_profile_path
+        %li= link_to t('.ordergroup'), my_ordergroup_path
+        %li= link_to t('.logout'), logout_path
     %li{class: ('disabled' if FoodsoftConfig.config[:homepage].blank?)}
       = link_to FoodsoftConfig.config[:name], FoodsoftConfig.config[:homepage]
-    %li= link_to "Hilfe", 'https://github.com/bennibu/foodsoft/wiki/Doku'
-    %li= link_to "Feedback", new_feedback_path, title: "Fehler gefunden? Vorschlag? Idee? Kritik?"
+    %li= link_to t('.help'), FoodsoftConfig.config[:help_url]
+    %li= link_to t('.feedback.title'), new_feedback_path, title: t('.feedback.desc')
   .clearfix
 
   .navbar
@@ -49,6 +49,5 @@
         = yield
 
     %footer
-      %p
-        Foodsoft, open source software to manage a non-profit food coop.
+      %p= t '.footer'
   #modalContainer.modal.hide.fade(tabindex="-1" role="dialog")