Edit UI sends editComment mutation, handles errors

client/coral-framework/graphql/mutations/editComment.graphql

@@ -0,0 +1,7 @@
+mutation EditComment ($id: ID!, $edit: EditCommentInput) {
+  editComment(id:$id, edit:$edit) {
+    errors {
+      translation_key
+    }
+  }
+}