Merge commit '55e7c08a83547424024bac311d5459cb82cf6dae' into glitch-soc/merge-upstream

Conflicts:
- `app/models/user_settings.rb`:
  Upstream added a constraint on a setting textually close
  to glitch-soc-only settings.
  Applied upstream's change.
- `lib/sanitize_ext/sanitize_config.rb`:
  Upstream added support for the `translate` attribute on a few elements,
  where glitch-soc had a different set of allowed elements and attributes.
  Extended glitch-soc's allowed attributes with `translate` as upstream did.
- `spec/validators/status_length_validator_spec.rb`:
  Upstream refactored to use RSpec's `instance_double` instead of `double`,
  but glitch-soc had changes to tests due to configurable max toot chars.
  Applied upstream's changes while keeping tests against configurable max
  toot chars.

lib/sanitize_ext/sanitize_config.rb

@@ -55,6 +55,11 @@ class Sanitize
       end
     end
 
+    TRANSLATE_TRANSFORMER = lambda do |env|
+      node = env[:node]
+      node.remove_attribute('translate') unless node['translate'] == 'no'
+    end
+
     UNSUPPORTED_HREF_TRANSFORMER = lambda do |env|
       return unless env[:node_name] == 'a'
 
@@ -73,9 +78,9 @@ class Sanitize
       elements: %w(p br span a abbr del pre blockquote code b strong u sub sup i em h1 h2 h3 h4 h5 ul ol li),
 
       attributes: {
-        'a' => %w(href rel class title),
+        'a' => %w(href rel class title translate),
         'abbr' => %w(title),
-        'span' => %w(class),
+        'span' => %w(class translate),
         'blockquote' => %w(cite),
         'ol' => %w(start reversed),
         'li' => %w(value),
@@ -96,6 +101,7 @@ class Sanitize
       transformers: [
         CLASS_WHITELIST_TRANSFORMER,
         IMG_TAG_TRANSFORMER,
+        TRANSLATE_TRANSFORMER,
         UNSUPPORTED_HREF_TRANSFORMER,
       ]
     )
@@ -151,7 +157,7 @@ class Sanitize
     MASTODON_OUTGOING ||= freeze_config MASTODON_STRICT.merge(
       attributes: merge(
         MASTODON_STRICT[:attributes],
-        'a' => %w(href rel class title target)
+        'a' => %w(href rel class title target translate)
       ),
 
       add_attributes: {},
@@ -159,6 +165,7 @@ class Sanitize
       transformers: [
         CLASS_WHITELIST_TRANSFORMER,
         IMG_TAG_TRANSFORMER,
+        TRANSLATE_TRANSFORMER,
         UNSUPPORTED_HREF_TRANSFORMER,
         LINK_REL_TRANSFORMER,
         LINK_TARGET_TRANSFORMER,