Bot nameplates (#7391)

* Store actor type in database

* Add bot nameplate to web UI, add setting to preferences, API, AP
Fix #7365

* Fix code style issues

app/views/accounts/_header.html.haml

@@ -10,7 +10,11 @@
         %span>< @#{account.local_username_and_domain}
         = fa_icon('lock') if account.locked?
 
-    - if Setting.show_staff_badge
+    - if account.bot?
+      .roles
+        .account-role.bot
+          = t 'accounts.roles.bot'
+    - elsif Setting.show_staff_badge
       - if account.user_admin?
         .roles
           .account-role.admin

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

@@ -19,6 +19,9 @@
   .fields-group
     = f.input :locked, as: :boolean, wrapper: :with_label, hint: t('simple_form.hints.defaults.locked')
 
+  .fields-group
+    = f.input :bot, as: :boolean, wrapper: :with_label, hint: t('simple_form.hints.defaults.bot')
+
   .fields-group
     .input.with_block_label
       %label= t('simple_form.labels.defaults.fields')