UX: Update "education.dominating_topic" and raise default percentage (#19154)

See /t/82396

config/locales/server.en.yml

@@ -542,7 +542,7 @@ en:
 
       It’s easier for everyone to read topics that have fewer in-depth replies versus lots of small, individual replies.
 
-    dominating_topic: You’ve posted more than %{percent}% of the replies here; may we suggest you give other people an opportunity to chime in?
+    dominating_topic: You’ve posted a lot in this topic! Consider giving others an opportunity to reply here and discuss things with each other as well.
 
     get_a_room: You’ve replied to @%{reply_username} %{count} times, did you know you could send them a personal message instead?
 

config/site_settings.yml

@@ -2311,7 +2311,7 @@ uncategorized:
   educate_until_posts: 2
   sequential_replies_threshold: 2
   get_a_room_threshold: 3
-  dominating_topic_minimum_percent: 20
+  dominating_topic_minimum_percent: 40
   disable_avatar_education_message: false
   pm_warn_user_last_seen_months_ago: 24
 

lib/composer_messages_finder.rb

@@ -145,7 +145,7 @@ class ComposerMessagesFinder
       templateName: 'dominating-topic',
       wait_for_typing: true,
       extraClass: 'education-message dominating-topic-message',
-      body: PrettyText.cook(I18n.t('education.dominating_topic', percent: (ratio * 100).round))
+      body: PrettyText.cook(I18n.t('education.dominating_topic'))
     }
   end