Changed no timezone set messages to get assumed time zone as parameter

and use the system time zone as parameter

app/controllers/meetings_controller.rb

@@ -48,8 +48,8 @@ class MeetingsController < ApplicationController
     end
     if @meeting.save
       text = l(:notice_successful_create)
-      link = l(:notice_timezone_missing)
-      if User.current.pref.time_zone == ""
+      if User.current.time_zone.nil?
+        link = l(:notice_timezone_missing, :zone => Time.now.zone)
         text += " #{view_context.link_to(link, {:controller => :my, :action => :account},:class => "link_to_profile")}"
       end
       flash[:notice] = text.html_safe

config/locales/de.yml

@@ -40,4 +40,4 @@ de:
         location: "Ort/Raum"
         duration: "Dauer"
 
-  notice_timezone_missing: Keine Zeitzone eingestellt und daher UTC angenommen. Um Ihre Zeitzone einzustellen, clicken Sie bitte hier.
+  notice_timezone_missing: Keine Zeitzone eingestellt und daher %{zone} angenommen. Um Ihre Zeitzone einzustellen, clicken Sie bitte hier.

config/locales/en.yml

@@ -40,4 +40,4 @@ en:
         location: "Location"
         duration: "Duration"
 
-  notice_timezone_missing: No time zone is set and UTC is assumed. To choose your time zone, please click here.
+  notice_timezone_missing: No time zone is set and %{zone} is assumed. To choose your time zone, please click here.