Update copy for category permission_conflict

Update copy for category permission_conflict

diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index 7d5ae6f..182b0a0 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -591,7 +591,7 @@ en:
       email_already_used_in_group: "'%{email}' is already used by the group '%{group_name}'."
       email_already_used_in_category: "'%{email}' is already used by the category '%{category_name}'."
       description_incomplete: "The category description post must have at least one paragraph."
-      permission_conflict: "Subcategory permissions cannot be less restrictive than parent's."
+      permission_conflict: "Any group that is allowed to access a subcategory must also be allowed to access the parent category."
       disallowed_topic_tags: "This topic has tags not allowed by this category: '%{tags}'"
     cannot_delete:
       uncategorized: "This category is special. It is intended as a holding area for topics that have no category; it cannot be deleted."

GitHub sha: 41f09ee2