add missing token validation on application settings page (#3976) (#3978)

modules/auth/user_form.go

@@ -182,7 +182,7 @@ func (f *AddKeyForm) Validate(ctx *macaron.Context, errs binding.Errors) binding
 
 // NewAccessTokenForm form for creating access token
 type NewAccessTokenForm struct {
-	Name string `binding:"Required"`
+	Name string `binding:"Required;MaxSize(255)"`
 }
 
 // Validate valideates the fields