Make error template UI usable

config/locales/en.yml

@@ -130,6 +130,11 @@ en:
         name: "Name"
         file_type: "File Type"
         content: "Content"
+      error_template:
+        name: Name
+        signature: Signature Regular Expression
+        description: Description
+        hint: Hint
     models:
       code_harbor_link:
         one: CodeHarbor Link
@@ -601,3 +606,6 @@ en:
     estimated_time_20_to_30: "between 20 and 30 minutes"
     estimated_time_more_30: "more than 30 minutes"
     working_time: "Estimated time working on this exercise:"
+  error_templates:
+    hints:
+      signature: "A regular expression in Ruby syntax without leading and trailing \"/\""