diff --git a/app/controllers/collections_controller.rb b/app/controllers/collections_controller.rb
index 5a9afb47d..9a3371798 100644
--- a/app/controllers/collections_controller.rb
+++ b/app/controllers/collections_controller.rb
@@ -115,8 +115,7 @@ def leave
 
   def share_message
     user = User.find_by(email: params[:user])
-    text = t('collections.share_message.text', user: current_user.name, collection: @collection.title, locale: :en)
-    Message.new(sender: current_user, recipient: user, param_type: 'collection', param_id: @collection.id, text:)
+    Message.new(sender: current_user, recipient: user, param_type: 'collection', param_id: @collection.id)
   end
 
   def push_exercises
diff --git a/app/controllers/groups_controller.rb b/app/controllers/groups_controller.rb
index 9921d7396..d91d2040e 100644
--- a/app/controllers/groups_controller.rb
+++ b/app/controllers/groups_controller.rb
@@ -61,7 +61,7 @@ def leave
   def request_access
     flash[:notice] = t('.success_notice')
     @group.admins.each do |admin|
-      send_access_request_message(admin, @group)
+      send_message(admin, :group_requested)
 
       AccessRequestMailer.send_access_request(current_user, admin, @group).deliver_now
     end
@@ -77,7 +77,7 @@ def remove_task
 
   def grant_access
     @group.grant_access(@user)
-    send_grant_access_messages(@user, @group)
+    send_message(@user, :group_accepted)
 
     Message.where(sender: @user, recipient: current_user, param_type: 'group', param_id: @group.id).destroy_all
     redirect_to @group, notice: t('.success_notice')
@@ -90,7 +90,7 @@ def delete_from_group
 
   def deny_access
     @group.users.delete(@user)
-    send_deny_access_message(@user, @group)
+    send_message(@user, :group_declined)
 
     Message.where(sender: @user, recipient: current_user, param_type: 'group', param_id: @group.id).destroy_all
     redirect_to @group, notice: t('.success_notice')
@@ -108,30 +108,12 @@ def demote_admin
 
   private
 
-  def send_access_request_message(admin, group)
+  # type is one of [group_requested, group_accepted, group_declined]
+  def send_message(recipient, type)
     Message.create(sender: current_user,
-      recipient: admin,
-      text: t('groups.send_access_request_message.message', user: current_user.name, group: group.name),
-      param_type: 'group',
-      param_id: group.id,
-      sender_status: 'd')
-  end
-
-  def send_deny_access_message(user, group)
-    Message.create(sender: current_user,
-      recipient: user,
-      text: t('groups.send_deny_access_message.message', user: current_user.name, group: group.name),
-      param_type: 'group_declined',
-      param_id: group.id,
-      sender_status: 'd')
-  end
-
-  def send_grant_access_messages(user, group)
-    Message.create(sender: current_user,
-      recipient: user,
-      text: t('groups.send_grant_access_messages.message', user: current_user.name, group: group.name),
-      param_type: 'group_accepted',
-      param_id: group.id,
+      recipient:,
+      param_type: type,
+      param_id: @group.id,
       sender_status: 'd')
   end
 
diff --git a/app/models/message.rb b/app/models/message.rb
index c3b48dfca..726b1db73 100644
--- a/app/models/message.rb
+++ b/app/models/message.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class Message < ApplicationRecord
-  validates :text, presence: true
+  validates :text, presence: true, unless: -> { %w[group_requested group_accepted group_declined collection].include?(param_type) }
 
   belongs_to :sender, class_name: 'User', inverse_of: :sent_messages
   belongs_to :recipient, class_name: 'User', inverse_of: :received_messages
@@ -18,7 +18,7 @@ def mark_as_deleted(user)
 
   def text # rubocop:disable Metrics/AbcSize
     case param_type
-      when 'group'
+      when 'group_requested'
         I18n.t('groups.send_access_request_message.message', user: sender.name, group: Group.find(param_id).name)
       when 'group_accepted'
         I18n.t('groups.send_grant_access_messages.message', user: sender.name, group: Group.find(param_id).name)
diff --git a/app/views/access_request_mailer/send_access_request.html.erb b/app/views/access_request_mailer/send_access_request.html.erb
index 27e0abfec..c35034620 100644
--- a/app/views/access_request_mailer/send_access_request.html.erb
+++ b/app/views/access_request_mailer/send_access_request.html.erb
@@ -4,13 +4,13 @@
   <meta content='text/html; charset=UTF-8' http-equiv='Content-Type' />
 </head>
 <body>
-<h3>Hello <%= @admin.name %></h3>
+<h3><%= t('groups.access_request_mailer.greeting', user: @admin.name) %></h3>
 <p>
-  <%= @user.name %> asked to join your group "<%= @group.name %>" <br/>
-  If you want to give your permission click on the link below. <br/>
-  Otherwise ignore this Email. <br/>
+  <%= t('groups.access_request_mailer.message_line1', user: @user.name, group: @group.name) %> <br/>
+  <%= t('groups.access_request_mailer.message_line2') %> <br/>
+  <%= t('groups.access_request_mailer.message_line3') %> <br/>
   <br/>
-  <%= link_to 'Confirm Request', group_url(@group)%>
+  <%= link_to t('groups.access_request_mailer.confirm_request'), group_url(@group)%>
 </p>
 </body>
 </html>
diff --git a/app/views/access_request_mailer/send_access_request.text.erb b/app/views/access_request_mailer/send_access_request.text.erb
index e4bb5334b..c71717b1e 100644
--- a/app/views/access_request_mailer/send_access_request.text.erb
+++ b/app/views/access_request_mailer/send_access_request.text.erb
@@ -1,6 +1,6 @@
-Hello <%= @admin.name %>
+<%= t('groups.access_request_mailer.greeting', user: @admin.name) %>
 
-<%= @user.name %> asked to join your group "<%= @group.name %>"
-If you want to give your permission click on the link below.
-Otherwise ignore this Email.
+<%= t('groups.access_request_mailer.message_line1', user: @user.name, group: @group.name) %>
+<%= t('groups.access_request_mailer.message_line2') %>
+<%= t('groups.access_request_mailer.message_line3') %>
 <%= group_url(@group)%>
diff --git a/app/views/access_request_mailer/send_contribution_request.html.erb b/app/views/access_request_mailer/send_contribution_request.html.erb
index 6c852d408..4f1c06d04 100644
--- a/app/views/access_request_mailer/send_contribution_request.html.erb
+++ b/app/views/access_request_mailer/send_contribution_request.html.erb
@@ -4,13 +4,13 @@
   <meta content='text/html; charset=UTF-8' http-equiv='Content-Type' />
 </head>
 <body>
-<h3>Hello <%= @author.name %></h3>
+<h3><%= t('tasks.access_request_mailer.greeting', user: @author.name) %></h3>
 <p>
-  <%= @user.name %> asked to contribute to your Exercise "<%= @exercise.title %>".
-  If you want to make him a co-author or suggest Membership to a group click the link below.
-  Otherwise ignore this Email. <br/>
+  <%= t('tasks.access_request_mailer.message_line1', user: @user.name, task: @exercise.title) %> <br/>
+  <%= t('tasks.access_request_mailer.message_line2') %> <br/>
+  <%= t('tasks.access_request_mailer.message_line3') %> <br/>
   <br/>
-  <%= link_to 'CodeHarbor', user_messages_url(@author)%>
+  <%= link_to t('common.app_name'), user_messages_url(@author)%>
 </p>
 </body>
 </html>
diff --git a/app/views/access_request_mailer/send_contribution_request.text.erb b/app/views/access_request_mailer/send_contribution_request.text.erb
index 4ce8ac114..0afe92e51 100644
--- a/app/views/access_request_mailer/send_contribution_request.text.erb
+++ b/app/views/access_request_mailer/send_contribution_request.text.erb
@@ -1,6 +1,7 @@
-Hello <%= @author.name %>
+<%= t('tasks.access_request_mailer.greeting', user: @author.name) %>
+
+<%= t('tasks.access_request_mailer.message_line1', user: @user.name, task: @exercise.title) %>
+<%= t('tasks.access_request_mailer.message_line2') %>
+<%= t('tasks.access_request_mailer.message_line3') %>
 
-<%= @user.name %> asked to contribute to your Exercise "<%= @exercise.title %>".
-If you want to make him a co-author or suggest Membership to a group click the link below.
-Otherwise ignore this Email.
 <%= user_messages_url(@author) %>
diff --git a/config/locales/de/common.yml b/config/locales/de/common.yml
index fd67167d0..9ae82f44f 100644
--- a/config/locales/de/common.yml
+++ b/config/locales/de/common.yml
@@ -1,6 +1,7 @@
 ---
 de:
   common:
+    app_name: CodeHarbor
     button:
       abort: Abbrechen
       back: Zurück
diff --git a/config/locales/de/views/groups.yml b/config/locales/de/views/groups.yml
index 1bc064602..5f8827b93 100644
--- a/config/locales/de/views/groups.yml
+++ b/config/locales/de/views/groups.yml
@@ -1,6 +1,13 @@
 ---
 de:
   groups:
+    access_request_mailer:
+      confirm_request: Anfrage annehmen
+      greeting: Hallo %{user}
+      message_line1: '%{user} möchte Ihrer Gruppe "%{group}" beitreten.'
+      message_line2: Sie können sie/ihn beitreten lassen, indem Sie auf den Link unten klicken.
+      message_line3: Ansonsten können Sie diese E-Mail ignorieren.
+      subject: '%{user} möchte Ihrer Grupper "%{group}" beitreten'
     form:
       button:
         save: Gruppe speichern
diff --git a/config/locales/de/views/tasks.yml b/config/locales/de/views/tasks.yml
index 86ba6d882..4772406ba 100644
--- a/config/locales/de/views/tasks.yml
+++ b/config/locales/de/views/tasks.yml
@@ -1,6 +1,12 @@
 ---
 de:
   tasks:
+    access_request_mailer:
+      greeting: Hallo %{user}
+      message_line1: '%{user} möchte an Ihrer Aufgabe "%{task}" mitarbeiten.'
+      message_line2: Wenn Sie den/die Benutzer:in zum/zur Co-Autor:in ernennen oder in eine Gruppe einladen möchten, klicken Sie auf den Link unten.
+      message_line3: Ansonsten können Sie diese E-Mail ignorieren.
+      subject: '%{user} möchte an Ihrer Aufgabe "%{task}" mitarbeiten.'
     editor:
       button:
         extract_text: Text extrahieren
diff --git a/config/locales/en/common.yml b/config/locales/en/common.yml
index 1c2284d0b..c22288721 100644
--- a/config/locales/en/common.yml
+++ b/config/locales/en/common.yml
@@ -1,6 +1,7 @@
 ---
 en:
   common:
+    app_name: CodeHarbor
     button:
       abort: Abort
       back: Back
diff --git a/config/locales/en/views/groups.yml b/config/locales/en/views/groups.yml
index 2690e7086..39e2d6b3f 100644
--- a/config/locales/en/views/groups.yml
+++ b/config/locales/en/views/groups.yml
@@ -1,6 +1,13 @@
 ---
 en:
   groups:
+    access_request_mailer:
+      confirm_request: Confirm Request
+      greeting: Hello %{user}
+      message_line1: '%{user} asked to join your group "%{group}".'
+      message_line2: If you want to give your permission click on the link below.
+      message_line3: Otherwise ignore this Email.
+      subject: '%{user} wants to access your Group "%{group}"'
     form:
       button:
         save: Save Group
diff --git a/config/locales/en/views/tasks.yml b/config/locales/en/views/tasks.yml
index 14dc2c520..d87443a93 100644
--- a/config/locales/en/views/tasks.yml
+++ b/config/locales/en/views/tasks.yml
@@ -1,6 +1,12 @@
 ---
 en:
   tasks:
+    access_request_mailer:
+      greeting: Hello %{user}
+      message_line1: '%{user} asked to contribute to your task "%{task}".'
+      message_line2: If you want to make them a co-author or suggest Membership to a group click the link below.
+      message_line3: Otherwise ignore this Email.
+      subject: '%{user} wants to contribute to your task "%{task}"'
     editor:
       button:
         extract_text: Extract text
diff --git a/spec/controllers/groups_controller_spec.rb b/spec/controllers/groups_controller_spec.rb
index 5d466bbda..d9481e439 100644
--- a/spec/controllers/groups_controller_spec.rb
+++ b/spec/controllers/groups_controller_spec.rb
@@ -5,7 +5,11 @@
 RSpec.describe GroupsController do
   render_views
 
-  let(:user) { create(:user) }
+  let(:user) { create(:user, preferred_locale: user_locale) }
+  let(:group_admin) { create(:user, preferred_locale: admin_locale) }
+
+  let(:user_locale) { :en }
+  let(:admin_locale) { :de }
 
   let(:valid_post_attributes) do
     attributes_for(:group, users: [user])
@@ -14,7 +18,7 @@
   let(:invalid_attributes) do
     {name: ''}
   end
-  let(:group_memberships) { [build(:group_membership, :with_admin), build(:group_membership, user:)] }
+  let(:group_memberships) { [build(:group_membership, :with_admin, user: group_admin), build(:group_membership, user:)] }
   let!(:group) { create(:group, group_memberships:) }
 
   before { sign_in user }
@@ -156,4 +160,62 @@
       end
     end
   end
+
+  describe 'POST #request_access' do
+    subject(:post_request) { post :request_access, params: {id: group.to_param} }
+
+    let(:group_memberships) { [build(:group_membership, :with_admin, user: group_admin)] }
+
+    it 'translates access request message into correct language for recipient' do
+      post_request
+      expect(I18n.with_locale(admin_locale) { group_admin.received_messages.find_by(param_type: 'group_requested').text }).to eq(I18n.t('groups.send_access_request_message.message', user: user.name, group: group.name, locale: admin_locale))
+    end
+
+    it 'sends mail in correct language for recipient' do
+      post_request
+      expect(ActionMailer::Base.deliveries.last.body.parts.first.body).to include(I18n.t('groups.access_request_mailer.message_line2', locale: admin_locale))
+    end
+  end
+
+  describe 'POST #grant_access' do
+    subject(:post_request) { post :grant_access, params: {id: group.to_param, user:} }
+
+    let(:group_memberships) { [build(:group_membership, :with_admin, user: group_admin)] }
+
+    before do
+      post :request_access, params: {id: group.to_param}
+      sign_in group_admin
+    end
+
+    it 'adds user to group' do
+      post_request
+      expect(group.users).to include(user)
+    end
+
+    it 'translates access granted message into correct language for recipient' do
+      post_request
+      expect(I18n.with_locale(user_locale) { user.received_messages.find_by(param_type: 'group_accepted').text }).to eq(I18n.t('groups.send_grant_access_messages.message', user: group_admin.name, group: group.name, locale: user_locale))
+    end
+  end
+
+  describe 'POST #deny_access' do
+    subject(:post_request) { post :deny_access, params: {id: group.to_param, user:} }
+
+    let(:group_memberships) { [build(:group_membership, :with_admin, user: group_admin)] }
+
+    before do
+      post :request_access, params: {id: group.to_param}
+      sign_in group_admin
+    end
+
+    it 'does not add user to group' do
+      post_request
+      expect(group.users).not_to include(user)
+    end
+
+    it 'translates access denied message into correct language for recipient' do
+      post_request
+      expect(I18n.with_locale(user_locale) { user.received_messages.find_by(param_type: 'group_declined').text }).to eq(I18n.t('groups.send_deny_access_message.message', user: group_admin.name, group: group.name, locale: user_locale))
+    end
+  end
 end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index d99adb3a8..67ceb32df 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -120,7 +120,7 @@
       context 'when message has type exercise', pending: 'messages and sharing permissions need to be reworked' do
         before do
           create(:message, sender: user, param_type: 'exercise')
-          create(:message, sender: user, param_type: 'group')
+          create(:message, sender: user, param_type: 'group_requested')
           create(:message, sender: user, param_type: 'collection')
         end