diff --git a/app/views/event_mailer/accept.text.haml b/app/views/event_mailer/accept.text.haml
index 27eabbec..443affb7 100644
--- a/app/views/event_mailer/accept.text.haml
+++ b/app/views/event_mailer/accept.text.haml
@@ -1,12 +1,12 @@
-= t '.body', moderator: @current_user
+!= t '.body', moderator: @current_user
 = surround '<'.html_safe, '>'.html_safe do
   = event_url @event
 \
-= t '.edit_link'
+!= t '.edit_link'
 = surround '<'.html_safe, '>'.html_safe do
   = edit_event_url @event, secret: @event.secret
 \
-= t '.delete_link'
+!= t '.delete_link'
 = surround '<'.html_safe, '>'.html_safe do
   = cancel_event_url @event, secret: @event.secret
 \
@@ -19,7 +19,7 @@
     = surround '<'.html_safe, '>'.html_safe do
       = cancel_event_url e, secret: e.secret
 \
-= t '.reminder'
+!= t '.reminder'
 = render file: '/events/show'
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/event_mailer/create.text.haml b/app/views/event_mailer/create.text.haml
index c4e04f8f..18452d32 100644
--- a/app/views/event_mailer/create.text.haml
+++ b/app/views/event_mailer/create.text.haml
@@ -1,10 +1,10 @@
-= t '.body', subject: @event.title,
+!= t '.body', subject: @event.title,
   start_time: l(@event.start_time, format: :at)
 = surround '<'.html_safe, '>'.html_safe do
   = edit_event_url @event, secret: @event.secret
 \
-= t '.delete_link'
+!= t '.delete_link'
 = surround '<'.html_safe, '>'.html_safe do
   = cancel_event_url @event, secret: @event.secret
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/event_mailer/destroy.text.haml b/app/views/event_mailer/destroy.text.haml
index 19a578c8..f28f122e 100644
--- a/app/views/event_mailer/destroy.text.haml
+++ b/app/views/event_mailer/destroy.text.haml
@@ -1,10 +1,10 @@
-= t '.body', author: @current_user
+!= t '.body', author: @current_user
 \
 = @event.reason
 \
-= t '.reclamation'
+!= t '.reclamation'
 \
-= t '.reminder'
+!= t '.reminder'
 = render file: '/events/show'
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/event_mailer/update.text.haml b/app/views/event_mailer/update.text.haml
index 36473891..8e59c7c4 100644
--- a/app/views/event_mailer/update.text.haml
+++ b/app/views/event_mailer/update.text.haml
@@ -1,4 +1,4 @@
-= t '.body', subject: @event.title, author: @current_user || t('.submitter')
+!= t '.body', subject: @event.title, author: @current_user || t('.submitter')
 
 :ruby
   new = render file: '/events/show'
@@ -11,9 +11,9 @@
 
   require 'differ/format/patch'
   Differ.format = Differ::Format::Patch
-= Differ.diff new, prev
+!= Differ.diff new, prev
 \
 = surround '<'.html_safe, '>'.html_safe do
   = edit_event_url @event, secret: @event.secret
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/events/show.text.haml b/app/views/events/show.text.haml
index 04642ea9..313b72fb 100644
--- a/app/views/events/show.text.haml
+++ b/app/views/events/show.text.haml
@@ -1,19 +1,19 @@
 ==============================================================================
-= display_attr @event, :title
-= display_attr @event, :start_time, l(@event.start_time, format: :at)
-= display_attr @event, :end_time, l(@event.end_time, format: :at)
-= display_attr @event, :place_name
-= display_attr @event, :address
-= display_attr @event, :city
-= display_attr @event, :region, @event.region
-= display_attr @event, :locality, t("attributes.locality_#{@event.locality}")
-= display_attr @event, :url
-= display_attr @event, :contact
-= display_attr @event, :submitter
-= display_attr @event, :tag_list, @event.tag_list
+!= display_attr @event, :title
+!= display_attr @event, :start_time, l(@event.start_time, format: :at)
+!= display_attr @event, :end_time, l(@event.end_time, format: :at)
+!= display_attr @event, :place_name
+!= display_attr @event, :address
+!= display_attr @event, :city
+!= display_attr @event, :region, @event.region
+!= display_attr @event, :locality, t("attributes.locality_#{@event.locality}")
+!= display_attr @event, :url
+!= display_attr @event, :contact
+!= display_attr @event, :submitter
+!= display_attr @event, :tag_list, @event.tag_list
 - if @event.repeat > 0
   = display_attr @event, :repeat
   = display_attr @event, :rule, t(@event.rule, scope: 'activerecord.attributes.event.rule_values')
 \
-= raw to_markdown @event.description, 78
+!= to_markdown @event.description, 78
 ==============================================================================
diff --git a/app/views/layouts/mailer.text.haml b/app/views/layouts/mailer.text.haml
index 03af2013..75ae1c2a 100644
--- a/app/views/layouts/mailer.text.haml
+++ b/app/views/layouts/mailer.text.haml
@@ -1,5 +1,5 @@
-= t '.title'
+!= t '.title'
 \
 = yield
 \-- 
-= t 'layouts.application.title'
+!= t 'layouts.application.title'
diff --git a/app/views/moderation_mailer/accept.text.haml b/app/views/moderation_mailer/accept.text.haml
index ffd075f0..9b408254 100644
--- a/app/views/moderation_mailer/accept.text.haml
+++ b/app/views/moderation_mailer/accept.text.haml
@@ -1,10 +1,10 @@
-= t '.body', author: @current_user
+!= t '.body', author: @current_user
 \
-= t '.reminder'
+!= t '.reminder'
 = render file: '/events/show'
 \
-= t '.access'
+!= t '.access'
 = surround '<'.html_safe, '>'.html_safe do
   = event_url @event
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/moderation_mailer/create.text.haml b/app/views/moderation_mailer/create.text.haml
index 33c41fa5..7267d199 100644
--- a/app/views/moderation_mailer/create.text.haml
+++ b/app/views/moderation_mailer/create.text.haml
@@ -1,8 +1,8 @@
-= t '.body', subject: @event.title, start_time: l(@event.start_time,
+!= t '.body', subject: @event.title, start_time: l(@event.start_time,
   format: :at)
 = surround '<'.html_safe, '>'.html_safe do
   = moderations_url
 \
 = render file: '/events/show'
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/moderation_mailer/destroy.text.haml b/app/views/moderation_mailer/destroy.text.haml
index cb64e2d9..984dee06 100644
--- a/app/views/moderation_mailer/destroy.text.haml
+++ b/app/views/moderation_mailer/destroy.text.haml
@@ -1,8 +1,8 @@
-= t '.body', subject: @event.title, author: @current_user
+!= t '.body', subject: @event.title, author: @current_user
 \
 = @event.reason
 \
-= t '.reminder'
+!= t '.reminder'
 = render file: '/events/show'
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/moderation_mailer/update.text.haml b/app/views/moderation_mailer/update.text.haml
index 0751b56b..99ac5568 100644
--- a/app/views/moderation_mailer/update.text.haml
+++ b/app/views/moderation_mailer/update.text.haml
@@ -1,4 +1,4 @@
-= t '.body', subject: @event.title, author: @current_user || t('.submitter')
+!= t '.body', subject: @event.title, author: @current_user || t('.submitter')
 
 :ruby
   new = render file: '/events/show'
@@ -11,9 +11,9 @@
 
   require 'differ/format/patch'
   Differ.format = Differ::Format::Patch
-= Differ.diff new, prev
+!= Differ.diff new, prev
 \
 = surround '<'.html_safe, '>'.html_safe do
   = edit_moderation_url @event
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/moderationorga_mailer/accept.text.haml b/app/views/moderationorga_mailer/accept.text.haml
index 95d41419..5b40b2ee 100644
--- a/app/views/moderationorga_mailer/accept.text.haml
+++ b/app/views/moderationorga_mailer/accept.text.haml
@@ -1,10 +1,10 @@
-= t '.body', author: @current_user
+!= t '.body', author: @current_user
 \
-= t '.reminder'
+!= t '.reminder'
 = render file: '/orgas/show'
 \
-= t '.access'
+!= t '.access'
 = surround '<'.html_safe, '>'.html_safe do
   = orga_url @orga
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/moderationorga_mailer/create.text.haml b/app/views/moderationorga_mailer/create.text.haml
index d8cc166e..6d67be81 100644
--- a/app/views/moderationorga_mailer/create.text.haml
+++ b/app/views/moderationorga_mailer/create.text.haml
@@ -1,7 +1,7 @@
-= t '.body', subject: @orga.name
+!= t '.body', subject: @orga.name
 = surround '<'.html_safe, '>'.html_safe do
   = moderations_url
 \
 = render file: '/orgas/show'
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/moderationorga_mailer/destroy.text.haml b/app/views/moderationorga_mailer/destroy.text.haml
index 7d9081cc..95c4d17b 100644
--- a/app/views/moderationorga_mailer/destroy.text.haml
+++ b/app/views/moderationorga_mailer/destroy.text.haml
@@ -1,6 +1,6 @@
-= t '.body', subject: @orga.name, author: @current_user
+!= t '.body', subject: @orga.name, author: @current_user
 \
-= t '.reminder'
+!= t '.reminder'
 = render file: '/orgas/show'
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/moderationorga_mailer/update.text.haml b/app/views/moderationorga_mailer/update.text.haml
index 281ce7c9..9a686d09 100644
--- a/app/views/moderationorga_mailer/update.text.haml
+++ b/app/views/moderationorga_mailer/update.text.haml
@@ -1,4 +1,4 @@
-= t '.body', subject: @orga.name, author: @current_user || t('.submitter')
+!= t '.body', subject: @orga.name, author: @current_user || t('.submitter')
 
 :ruby
   new = render file: '/orgas/show'
@@ -11,9 +11,9 @@
 
   require 'differ/format/patch'
   Differ.format = Differ::Format::Patch
-= Differ.diff new, prev
+!= Differ.diff new, prev
 \
 = surround '<'.html_safe, '>'.html_safe do
   = edit_orga_url @orga
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/note_mailer/create.text.haml b/app/views/note_mailer/create.text.haml
index e0cb3bd1..49405f5e 100644
--- a/app/views/note_mailer/create.text.haml
+++ b/app/views/note_mailer/create.text.haml
@@ -1,8 +1,8 @@
-= t '.body', subject: @note.event.title, contents: @note.contents
+!= t '.body', subject: @note.event.title, contents: @note.contents
 \
-= strip_tags @note.contents
+!= strip_tags @note.contents
 \
 = surround '<'.html_safe, '>'.html_safe do
   = moderations_url
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/note_mailer/notify.text.haml b/app/views/note_mailer/notify.text.haml
index 4022eb8c..e336e5c4 100644
--- a/app/views/note_mailer/notify.text.haml
+++ b/app/views/note_mailer/notify.text.haml
@@ -1,12 +1,12 @@
-= t '.body', subject: @note.event.title, contents: @note.contents
+!= t '.body', subject: @note.event.title, contents: @note.contents
 \
-= sanitize @note.contents.html_safe,
-  tags: %w(p br table tr td ul ol li a strong b em i img),
-  attributes: %w(href src width height)
+!= sanitize @note.contents.html_safe,
+  tags: %w[p br table tr td ul ol li a strong b em i img],
+  attributes: %w[href src width height]
 \
-= t '.edit_link'
+!= t '.edit_link'
 \
 = surround '<'.html_safe, '>'.html_safe do
   = edit_event_url @note.event, secret: @note.event.secret
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/orga_mailer/accept.text.haml b/app/views/orga_mailer/accept.text.haml
index 2264290f..e4be0a49 100644
--- a/app/views/orga_mailer/accept.text.haml
+++ b/app/views/orga_mailer/accept.text.haml
@@ -1,9 +1,9 @@
-= t '.body', author: @current_user
+!= t '.body', author: @current_user
 \
 = render file: '/orgas/show'
 \
-= t '.access'
+!= t '.access'
 = surround '<'.html_safe, '>'.html_safe do
   = orga_url @orga
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/orga_mailer/create.text.haml b/app/views/orga_mailer/create.text.haml
index d096d55a..45f8c6ec 100644
--- a/app/views/orga_mailer/create.text.haml
+++ b/app/views/orga_mailer/create.text.haml
@@ -1,9 +1,9 @@
-= t '.body', subject: @orga.name
+!= t '.body', subject: @orga.name
 = surround '<'.html_safe, '>'.html_safe do
   = edit_orga_url @orga, secret: @orga.secret
 \
-= t '.delete_link'
+!= t '.delete_link'
 = surround '<'.html_safe, '>'.html_safe do
   = cancel_orga_url @orga, secret: @orga.secret
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/orga_mailer/destroy.text.haml b/app/views/orga_mailer/destroy.text.haml
index 20356819..c2d0b7ff 100644
--- a/app/views/orga_mailer/destroy.text.haml
+++ b/app/views/orga_mailer/destroy.text.haml
@@ -1,10 +1,10 @@
-= t '.body', author: @current_user
+!= t '.body', author: @current_user
 \
 = @reason
 \
-= t '.reclamation'
+!= t '.reclamation'
 \
-= t '.reminder'
+!= t '.reminder'
 = render file: '/orgas/show'
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/orga_mailer/update.text.haml b/app/views/orga_mailer/update.text.haml
index 416ee740..42a94b72 100644
--- a/app/views/orga_mailer/update.text.haml
+++ b/app/views/orga_mailer/update.text.haml
@@ -1,5 +1,5 @@
-= t '.body', subject: @orga.name, author: @current_user || t('.submitter')
-\
+!= t '.body', subject: @orga.name, author: @current_user || t('.submitter')
+
 :ruby
   new = render file: '/orgas/show'
 
@@ -11,9 +11,9 @@
 
   require 'differ/format/patch'
   Differ.format = Differ::Format::Patch
-= Differ.diff new, prev
+!= Differ.diff new, prev
 \
 = surround '<'.html_safe, '>'.html_safe do
   = edit_orga_url @orga, secret: @orga.secret
 \
-= t '.signature'
+!= t '.signature'
diff --git a/app/views/orgas/show.text.haml b/app/views/orgas/show.text.haml
index e23fd62f..4d89d864 100644
--- a/app/views/orgas/show.text.haml
+++ b/app/views/orgas/show.text.haml
@@ -1,18 +1,18 @@
 ==============================================================================
-= display_attr @orga, :kind, t("activerecord.attributes.kind.name_#{@orga.kind.name}")
-= display_attr @orga, :name
-= display_attr @orga, :place_name
-= display_attr @orga, :address
-= display_attr @orga, :city
-= display_attr @orga, :department
-= display_attr @orga, :region, @orga.region
-= display_attr @orga, :url
-= display_attr @orga, :diaspora
-= display_attr @orga, :feed
-= display_attr @orga, :contact
-= display_attr @orga, :submitter
-= display_attr @orga, :tag_list, @orga.tag_list
-= display_attr @orga, :active, t(@orga.active.to_s)
+!= display_attr @orga, :kind, t("activerecord.attributes.kind.name_#{@orga.kind.name}")
+!= display_attr @orga, :name
+!= display_attr @orga, :place_name
+!= display_attr @orga, :address
+!= display_attr @orga, :city
+!= display_attr @orga, :department
+!= display_attr @orga, :region, @orga.region
+!= display_attr @orga, :url
+!= display_attr @orga, :diaspora
+!= display_attr @orga, :feed
+!= display_attr @orga, :contact
+!= display_attr @orga, :submitter
+!= display_attr @orga, :tag_list, @orga.tag_list
+!= display_attr @orga, :active, t(@orga.active.to_s)
 \
-= to_markdown @orga.description, 78
+!= to_markdown @orga.description, 78
 ==============================================================================
diff --git a/lib/differ/format/patch.rb b/lib/differ/format/patch.rb
index 7bf62db3..2cd8e980 100644
--- a/lib/differ/format/patch.rb
+++ b/lib/differ/format/patch.rb
@@ -19,11 +19,13 @@ module Differ
         private
 
         def as_insert(change)
-          "+ #{change.insert}"
+          change.insert[0] = '+'
+          change.insert
         end
 
         def as_delete(change)
-          "- #{change.delete}"
+          change.delete[0] = '-'
+          change.delete
         end
 
         def as_change(change)
diff --git a/test/mailers/previews/event_mailer_preview.rb b/test/mailers/previews/event_mailer_preview.rb
index ff8c6534..67721f64 100644
--- a/test/mailers/previews/event_mailer_preview.rb
+++ b/test/mailers/previews/event_mailer_preview.rb
@@ -12,6 +12,18 @@ class EventMailerPreview < ActionMailer::Preview
     EventMailer.accept Event.last
   end
 
+  # Preview this email at http://localhost:3000/rails/mailers/event_mailer/update
+  def update
+    ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
+    event = Event.first
+
+    event.start_time += 1.day
+    event.description = event.description + '
+hello world'
+
+    EventMailer.update event
+  end
+
   # Preview this email at http://localhost:3000/rails/mailers/event_mailer/destroy
   def destroy
     ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
diff --git a/test/mailers/previews/moderation_mailer_preview.rb b/test/mailers/previews/moderation_mailer_preview.rb
index 0131db8a..366a8be0 100644
--- a/test/mailers/previews/moderation_mailer_preview.rb
+++ b/test/mailers/previews/moderation_mailer_preview.rb
@@ -11,7 +11,6 @@ class ModerationMailerPreview < ActionMailer::Preview
     ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
     event = Event.first
 
-    event.tags += ' ho'
     event.start_time += 1.day
     event.description = event.description + '
 hello world'
diff --git a/test/mailers/previews/moderationorga_mailer_preview.rb b/test/mailers/previews/moderationorga_mailer_preview.rb
index e443d5f3..f0a5ae14 100644
--- a/test/mailers/previews/moderationorga_mailer_preview.rb
+++ b/test/mailers/previews/moderationorga_mailer_preview.rb
@@ -11,8 +11,8 @@ class ModerationorgaMailerPreview < ActionMailer::Preview
     ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
     orga = Orga.first
 
-    orga.tags += ' ho'
     orga.save!
+    orga.name += ' et hop!'
     orga.description = orga.description + '
 hello world'