Add spec coverage and refactor authorize_follows controller (#2505)

app/views/authorize_follows/_card.html.haml

@@ -0,0 +1,12 @@
+.account-card
+  .detailed-status__display-name
+    %div
+      = image_tag account.avatar.url(:original), alt: '', width: 48, height: 48, class: 'avatar'
+
+    %span.display-name
+      = link_to TagManager.instance.url_for(account), class: 'detailed-status__display-name p-author h-card', target: '_blank', rel: 'noopener' do
+        %strong.emojify= display_name(account)
+        %span= "@#{account.acct}"
+
+  - if account.note?
+    .account__header__content.emojify= Formatter.instance.simplified_format(account)

app/views/authorize_follows/error.html.haml

@@ -0,0 +1,3 @@
+.form-container
+  .flash-message#error_explanation
+    = t('authorize_follow.error')

app/views/authorize_follows/show.html.haml

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+- content_for :page_title do
+  = t('authorize_follow.title', acct: @account.acct)
+
+.form-container
+  .follow-prompt
+    %h2= t('authorize_follow.prompt_html', self: current_account.username)
+
+    = render 'card', account: @account
+
+  = form_tag authorize_follow_path, method: :post, class: 'simple_form' do
+    = hidden_field_tag :acct, @account.acct
+    = button_tag t('authorize_follow.follow'), type: :submit