Move writeError to api.go

Web interface now uses error HTML template instead.

api.go

@@ -5,6 +5,11 @@ import (
 	"net/http"
 )
 
+func writeError(w http.ResponseWriter, status int, err interface{}) {
+	w.WriteHeader(status)
+	fmt.Fprintln(w, err)
+}
+
 func CreateApiHandler(settings *TranslateSettings) func(w http.ResponseWriter, req *http.Request) {
 	return func(w http.ResponseWriter, req *http.Request) {
 		from := req.FormValue("from")

utils.go

@@ -1,11 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"net/http"
-)
-
-func writeError(w http.ResponseWriter, status int, err interface{}) {
-	w.WriteHeader(status)
-	fmt.Fprintln(w, err)
-}