fix tests, rename setting 9

Author: xfalcox

config/locales/server.en.yml

@@ -86,7 +86,7 @@ en:
     ai_summarization_model: "Model to use for summarization."
     ai_custom_summarization_allowed_groups: "Groups allowed to use create new summaries."
     ai_pm_summarization_allowed_groups: "Groups allowed to create and view summaries in PMs."
-    ai_summary_gists_enabled: "After updating topics in the hot list, we'll generate brief summaries of the first N ones. (Disabled when 0)"
+    ai_summary_gists_enabled: "Generate brief summaries of latest replies in topics automatically."
     ai_hot_topic_gists_allowed_groups: "Groups allowed to see gists in the hot topics list."
     ai_summary_backfill_maximum_topics_per_hour: "Number of topic summaries to backfill per hour."