Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- app/controllers/about_controller.rb
- app/controllers/tags_controller.rb
- app/views/about/show.html.haml
- spec/views/about/show.html.haml_spec.rb

app/models/account.rb

@@ -474,6 +474,7 @@ class Account < ApplicationRecord
 
   before_create :generate_keys
   before_validation :prepare_contents, if: :local?
+  before_validation :prepare_username, on: :create
   before_destroy :clean_feed_manager
 
   private
@@ -483,6 +484,10 @@ class Account < ApplicationRecord
     note&.strip!
   end
 
+  def prepare_username
+    username&.squish!
+  end
+
   def generate_keys
     return unless local? && !Rails.env.test?