adjust validation message

app/javascript/elements/custom_validation.js

@@ -1,14 +0,0 @@
-export default class extends HTMLElement {
-  connectedCallback () {
-    const input = this.querySelector('input')
-    const invalidMessage = this.dataset.invalidMessage || ''
-
-    input.addEventListener('invalid', () => {
-      input.setCustomValidity(input.value ? invalidMessage : '')
-    })
-
-    input.addEventListener('input', () => {
-      input.setCustomValidity('')
-    })
-  }
-}