UX: Make "Category" in topic validation errors translatable

UX: Make “Category” in topic validation errors translatable

diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index 3f61910..0559c83 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -460,6 +460,7 @@ en:
       topic:
         title: "Title"
         featured_link: "Featured Link"
+        category_id: "Category"
       post:
         raw: "Body"
       user_profile:

GitHub sha: 964e7edc

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