Standardize the way we check for and display form errors

- Some views had a "Close" button. We've removed this, because we don't
  want users accidentally hiding the validation errors and not knowing
  what needs to be fixed.
- Some views used `li`, some used `p`, some used `span`. We've
  standardized on `li`.
- Some views only showed the first error. We've standardized on showing
  all of them.
- Some views added an `#error_explanation` div, which we've made
  standard.

app/helpers/form_helper.rb

+module FormHelper
+  def form_errors(model)
+    return unless model.errors.any?
+
+    pluralized = 'error'.pluralize(model.errors.count)
+    headline   = "The form contains the following #{pluralized}:"
+
+    content_tag(:div, class: 'alert alert-danger', id: 'error_explanation') do
+      content_tag(:h4, headline) <<
+      content_tag(:ul) do
+        model.errors.full_messages.
+          map { |msg| content_tag(:li, msg) }.
+          join.
+          html_safe
+      end
+    end
+  end
+end

app/views/abuse_reports/new.html.haml

@@ -3,11 +3,9 @@
 %p Please use this form to report users who create spam issues, comments or behave inappropriately.
 %hr
 = form_for @abuse_report, html: { class: 'form-horizontal js-quick-submit js-requires-input'} do |f|
+  = form_errors(@abuse_report)
+
   = f.hidden_field :user_id
-  - if @abuse_report.errors.any?
-    .alert.alert-danger
-      - @abuse_report.errors.full_messages.each do |msg|
-        %p= msg
   .form-group
     = f.label :user_id, class: 'control-label'
     .col-sm-10

app/views/admin/appearances/_form.html.haml

 = form_for @appearance, url: admin_appearances_path, html: { class: 'form-horizontal'} do |f|
-  - if @appearance.errors.any?
-    .alert.alert-danger
-      - @appearance.errors.full_messages.each do |msg|
-        %p= msg
+  = form_errors(@appearance)
   %fieldset.sign-in
     %legend

app/views/admin/application_settings/_form.html.haml

 = form_for @application_setting, url: admin_application_settings_path, html: { class: 'form-horizontal fieldset-form' } do |f|
-  - if @application_setting.errors.any?
-    #error_explanation
-      .alert.alert-danger
-        - @application_setting.errors.full_messages.each do |msg|
-          %p= msg
+  = form_errors(@application_setting)
   %fieldset
     %legend Visibility and Access Controls

app/views/admin/applications/_form.html.haml

 = form_for [:admin, @application], url: @url, html: {class: 'form-horizontal', role: 'form'} do |f|
-  - if application.errors.any?
-    .alert.alert-danger
-      %button{ type: "button", class: "close", "data-dismiss" => "alert"} ×
-      - application.errors.full_messages.each do |msg|
-        %p= msg
+  = form_errors(application)
+
   = content_tag :div, class: 'form-group' do
     = f.label :name, class: 'col-sm-2 control-label'
     .col-sm-10

app/views/admin/broadcast_messages/_form.html.haml

@@ -4,10 +4,8 @@
     = render_broadcast_message(@broadcast_message.message.presence || "Your message here")
 = form_for [:admin, @broadcast_message], html: { class: 'broadcast-message-form form-horizontal js-quick-submit js-requires-input'} do |f|
-  -if @broadcast_message.errors.any?
-    .alert.alert-danger
-      - @broadcast_message.errors.full_messages.each do |msg|
-        %p= msg
+  = form_errors(@broadcast_message)
+
   .form-group
     = f.label :message, class: 'control-label'
     .col-sm-10

app/views/admin/deploy_keys/new.html.haml

@@ -4,11 +4,7 @@
 %div
   = form_for [:admin, @deploy_key], html: { class: 'deploy-key-form form-horizontal' } do |f|
-    -if @deploy_key.errors.any?
-      .alert.alert-danger
-        %ul
-          - @deploy_key.errors.full_messages.each do |msg|
-            %li= msg
+    = form_errors(@deploy_key)
     .form-group
       = f.label :title, class: "control-label"

app/views/admin/groups/_form.html.haml

 = form_for [:admin, @group], html: { class: "form-horizontal" } do |f|
-  - if @group.errors.any?
-    .alert.alert-danger
-      %span= @group.errors.full_messages.first
-
+  = form_errors(@group)
   = render 'shared/group_form', f: f
   .form-group.group-description-holder

app/views/admin/hooks/index.html.haml

@@ -10,10 +10,8 @@
 = form_for @hook, as: :hook, url: admin_hooks_path, html: { class: 'form-horizontal' } do |f|
-  -if @hook.errors.any?
-    .alert.alert-danger
-      - @hook.errors.full_messages.each do |msg|
-        %p= msg
+  = form_errors(@hook)
+
   .form-group
     = f.label :url, "URL:", class: 'control-label'
     .col-sm-10

app/views/admin/identities/_form.html.haml

 = form_for [:admin, @user, @identity], html: { class: 'form-horizontal fieldset-form' } do |f|
-  - if @identity.errors.any?
-    #error_explanation
-      .alert.alert-danger
-        - @identity.errors.full_messages.each do |msg|
-          %p= msg
+  = form_errors(@identity)
   .form-group
     = f.label :provider, class: 'control-label'

app/views/admin/labels/_form.html.haml

 = form_for [:admin, @label], html: { class: 'form-horizontal label-form js-requires-input' } do |f|
-  -if @label.errors.any?
-    .row
-      .col-sm-offset-2.col-sm-10
-        .alert.alert-danger
-          - @label.errors.full_messages.each do |msg|
-            %span= msg
-            %br
+  = form_errors(@label)
   .form-group
     = f.label :title, class: 'control-label'

app/views/admin/users/_form.html.haml

 .user_new
   = form_for [:admin, @user], html: { class: 'form-horizontal fieldset-form' } do |f|
-    -if @user.errors.any?
-      #error_explanation
-        .alert.alert-danger
-          - @user.errors.full_messages.each do |msg|
-            %p= msg
+    = form_errors(@user)
     %fieldset
       %legend Account

app/views/doorkeeper/applications/_form.html.haml

 = form_for application, url: doorkeeper_submit_path(application), html: {role: 'form'} do |f|
-  - if application.errors.any?
-    .alert.alert-danger
-      %ul
-        - application.errors.full_messages.each do |msg|
-          %li= msg
+  = form_errors(application)
   .form-group
     = f.label :name, class: 'label-light'

app/views/groups/edit.html.haml

@@ -5,9 +5,7 @@
     Group settings
   .panel-body
     = form_for @group, html: { multipart: true, class: "form-horizontal" }, authenticity_token: true do |f|
-      - if @group.errors.any?
-        .alert.alert-danger
-          %span= @group.errors.full_messages.first
+      = form_errors(@group)
       = render 'shared/group_form', f: f
       .form-group

app/views/groups/new.html.haml

@@ -6,10 +6,7 @@
 %hr
 = form_for @group, html: { class: 'group-form form-horizontal' } do |f|
-  - if @group.errors.any?
-    .alert.alert-danger
-      %span= @group.errors.full_messages.first
-
+  = form_errors(@group)
   = render 'shared/group_form', f: f, autofocus: true
   .form-group.group-description-holder

app/views/profiles/keys/_form.html.haml

 %div
   = form_for [:profile, @key], html: { class: 'js-requires-input' } do |f|
-    - if @key.errors.any?
-      .alert.alert-danger
-        %ul
-          - @key.errors.full_messages.each do |msg|
-            %li= msg
+    = form_errors(@key)
     .form-group
       = f.label :key, class: 'label-light'

app/views/profiles/notifications/show.html.haml

@@ -2,11 +2,7 @@
 - header_title page_title, profile_notifications_path
 = form_for @user, url: profile_notifications_path, method: :put, html: { class: 'update-notifications prepend-top-default' } do |f|
-  -if @user.errors.any?
-    %div.alert.alert-danger
-      %ul
-        - @user.errors.full_messages.each do |msg|
-          %li= msg
+  = form_errors(@user)
   = hidden_field_tag :notification_type, 'global'
   .row

app/views/profiles/passwords/edit.html.haml

@@ -13,11 +13,8 @@
       - unless @user.password_automatically_set?
         or recover your current one
     = form_for @user, url: profile_password_path, method: :put, html: {class: "update-password"} do |f|
-      -if @user.errors.any?
-        .alert.alert-danger
-          %ul
-            - @user.errors.full_messages.each do |msg|
-              %li= msg
+      = form_errors(@user)
+
       - unless @user.password_automatically_set?
         .form-group
           = f.label :current_password, class: 'label-light'

app/views/profiles/passwords/new.html.haml

@@ -7,11 +7,8 @@
     Please set a new password before proceeding.
     %br
     After a successful password update you will be redirected to login screen.
-  -if @user.errors.any?
-    .alert.alert-danger
-      %ul
-        - @user.errors.full_messages.each do |msg|
-          %li= msg
+
+  = form_errors(@user)
   - unless @user.password_automatically_set?
     .form-group

app/views/profiles/show.html.haml

 = form_for @user, url: profile_path, method: :put, html: { multipart: true, class: "edit-user prepend-top-default" }, authenticity_token: true do |f|
-  -if @user.errors.any?
-    %div.alert.alert-danger
-      %ul
-        - @user.errors.full_messages.each do |msg|
-          %li= msg
+  = form_errors(@user)
+
   .row
     .col-lg-3.profile-settings-sidebar
       %h4.prepend-top-0