UX: when a post is blocked due to a watched word, message includes the word being blocked

config/locales/server.en.yml

@@ -221,7 +221,7 @@ en:
   too_many_links:
     one: "Sorry, new users can only put one link in a post."
     other: "Sorry, new users can only put %{count} links in a post."
-  contains_blocked_words: "Your post contains words that aren't allowed."
+  contains_blocked_words: "Your post contains a word that's not allowed: %{word}"
 
   spamming_host: "Sorry you cannot post a link to that host."
   user_is_suspended: "Suspended users are not allowed to post."

lib/new_post_manager.rb

@@ -133,9 +133,9 @@ class NewPostManager
   end
 
   def perform
-    if !self.class.exempt_user?(@user) && WordWatcher.new("#{@args[:title]} #{@args[:raw]}").should_block?
+    if !self.class.exempt_user?(@user) && matches = WordWatcher.new("#{@args[:title]} #{@args[:raw]}").should_block?
       result = NewPostResult.new(:created_post, false)
-      result.errors[:base] << I18n.t('contains_blocked_words')
+      result.errors[:base] << I18n.t('contains_blocked_words', word: matches[0])
       return result
     end
 

lib/validators/post_validator.rb

@@ -58,8 +58,8 @@ class Validators::PostValidator < ActiveModel::Validator
   end
 
   def watched_words(post)
-    if !post.acting_user&.staff? && !post.acting_user&.staged && WordWatcher.new(post.raw).should_block?
-      post.errors[:base] << I18n.t('contains_blocked_words')
+    if !post.acting_user&.staff? && !post.acting_user&.staged && matches = WordWatcher.new(post.raw).should_block?
+      post.errors[:base] << I18n.t('contains_blocked_words', word: matches[0])
     end
   end
 

spec/integration/watched_words_spec.rb

@@ -21,7 +21,7 @@ describe WatchedWord do
       expect {
         result = manager.perform
         expect(result).to_not be_success
-        expect(result.errors[:base]&.first).to eq(I18n.t('contains_blocked_words'))
+        expect(result.errors[:base]&.first).to eq(I18n.t('contains_blocked_words', word: block_word.word))
       }.to_not change { Post.count }
     end