Can assign a parent category to a category.

config/locales/client.en.yml

@@ -975,6 +975,7 @@ en:
       add_permission: "Add Permission"
       this_year: "this year"
       position: "position"
+      parent: "Parent Category"
 
     flagging:
       title: 'Why are you flagging this post?'

config/locales/server.en.yml

@@ -159,7 +159,9 @@ en:
     topic_prefix: "Category definition for %{category}"
     replace_paragraph: "[Replace this first paragraph with a short description of your new category. This guidance will appear in the category selection area, so try to keep it below 200 characters.]"
     post_template: "%{replace_paragraph}\n\nUse the following paragraphs for a longer description, as well as to establish any category guidelines or rules.\n\nSome things to consider in any discussion replies below:\n\n- What is this category for? Why should people select this category for their topic?\n\n- How is this different than the other categories we already have?\n\n- Do we need this category?\n\n- Should we merge this with another category, or split it into more categories?\n"
-
+    errors:
+      self_parent: "A subcategory's parent cannot be itself."
+      depth: "You can't nest a subcategory under another."
   trust_levels:
     newuser:
       title: "new user"