Update misspell to 0.5.1 and add misspellings.csv (#30573)

Misspell 0.5.0 supports passing a csv file to extend the list of
misspellings, so I added some common ones from the codebase. There is at
least one typo in a API response so we need to decided whether to revert
that and then likely remove the dict entry.

modules/templates/helper_test.go

@@ -49,9 +49,9 @@ func TestSubjectBodySeparator(t *testing.T) {
 	test("Multiple\n---\n-------\n---\nSeparators",
 		"Multiple\n",
 		"\n-------\n---\nSeparators")
-	test("Insuficient\n--\nSeparators",
+	test("Insufficient\n--\nSeparators",
 		"",
-		"Insuficient\n--\nSeparators")
+		"Insufficient\n--\nSeparators")
 }
 
 func TestJSEscapeSafe(t *testing.T) {