diff --git a/frontend/app/components/inplace-edit/services/work-package-field.service.js b/frontend/app/components/inplace-edit/services/work-package-field.service.js
index 2ab5234c15..5050dfa082 100644
--- a/frontend/app/components/inplace-edit/services/work-package-field.service.js
+++ b/frontend/app/components/inplace-edit/services/work-package-field.service.js
@@ -365,30 +365,27 @@ function WorkPackageFieldService($q, $http, $filter, I18n,  WorkPackagesHelper,
       return null;
     }
 
-    var mappings = {
+    var fieldMapping = {
       dueDate: 'date',
       startDate: 'date',
       createdAt: 'datetime',
       updatedAt: 'datetime'
-    };
+    }[field] || schema.props[field].type;
 
-    if (schema.props[field] && schema.props[field]) {
-      if (schema.props[field].type === 'Duration') {
+    switch(fieldMapping) {
+      case('Duration'):
         var hours = moment.duration(value).asHours();
         var formattedHours = $filter('number')(hours, 2);
         return I18n.t('js.units.hour', { count: formattedHours });
-      }
-
-      if (schema.props[field].type === 'Boolean') {
+      case('Boolean'):
         return value ? I18n.t('js.general_text_yes') : I18n.t('js.general_text_no');
-      }
-
-      if (workPackage.schema.props[field].type === 'Date') {
+      case('Date'):
         return value;
-      }
+      case('Float'):
+        return $filter('number')(value);
+      default:
+        return WorkPackagesHelper.formatValue(value, fieldMapping);
     }
-
-    return WorkPackagesHelper.formatValue(value, mappings[field]);
   }
 
   var WorkPackageFieldService = {
diff --git a/lib/plugins/acts_as_journalized/lib/journal_formatter/fraction.rb b/lib/plugins/acts_as_journalized/lib/journal_formatter/fraction.rb
index fc9b3c2ea1..dc1dd574a4 100644
--- a/lib/plugins/acts_as_journalized/lib/journal_formatter/fraction.rb
+++ b/lib/plugins/acts_as_journalized/lib/journal_formatter/fraction.rb
@@ -27,11 +27,13 @@
 #++
 
 class JournalFormatter::Fraction < JournalFormatter::Attribute
+  include ActionView::Helpers::NumberHelper
+
   def format_values(values)
     values.map do |v|
       v.nil? ?
         nil :
-        '%0.02f' % v.to_f
+        number_with_precision(v.to_f, precision: 2)
     end
   end
 end
diff --git a/lib/redmine/custom_field_format.rb b/lib/redmine/custom_field_format.rb
index 41c31bd8e3..d0fc9bbb59 100644
--- a/lib/redmine/custom_field_format.rb
+++ b/lib/redmine/custom_field_format.rb
@@ -30,6 +30,7 @@
 module Redmine
   class CustomFieldFormat
     include Redmine::I18n
+    include ActionView::Helpers::NumberHelper
 
     cattr_accessor :available
     @@available = {}
@@ -56,12 +57,16 @@ module Redmine
       l(is_true ? :general_text_Yes : :general_text_No)
     end
 
-    ['string', 'text', 'int', 'float', 'list'].each do |name|
+    ['string', 'text', 'int', 'list'].each do |name|
       define_method("format_as_#{name}") {|value|
         return value.to_s
       }
     end
 
+    def format_as_float(value)
+      number_with_delimiter(value.to_s)
+    end
+
     ['user', 'version'].each do |name|
       define_method("format_as_#{name}") {|value|
         return value.blank? ? '' : name.classify.constantize.find_by(id: value.to_i).to_s
diff --git a/spec/lib/redmine/custom_field_format_spec.rb b/spec/lib/redmine/custom_field_format_spec.rb
new file mode 100644
index 0000000000..a7cbab01b9
--- /dev/null
+++ b/spec/lib/redmine/custom_field_format_spec.rb
@@ -0,0 +1,41 @@
+#-- copyright
+# OpenProject is a project management system.
+# Copyright (C) 2012-2015 the OpenProject Foundation (OPF)
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See doc/COPYRIGHT.rdoc for more details.
+#++
+
+require 'spec_helper'
+
+describe Redmine::CustomFieldFormat do
+  let(:instance) { described_class.new 'test', label: 'blubs', order: '1' }
+
+  describe '#format_value' do
+    it 'returns a localized float' do
+      I18n.with_locale(:de) do
+        expect(instance.format_as_float('5.67')).to eql '5,67'
+      end
+    end
+  end
+end