Fix tests by simplifying an import

I think that JS event listeners aren't promise-aware, so there's a race condition in the test. It works fine in my browser though; rather than spending time debugging, I'm choosing to remove the promise. It might be worth looking at the resulting bundle sizes to make sure it doesn't slow it down too much.

Refs #1817, 593f930

.eslintrc.json

@@ -32,12 +32,6 @@
         "@typescript-eslint/no-unused-expressions": "off"
       }
     },
-    {
-      "files": ["assets/**/*.ts"],
-      "rules": {
-        "@typescript-eslint/no-misused-promises": ["error", { "checksVoidReturn": false }]
-      }
-    },
     {
       "files": ["integration/**/*.ts", "visual-regression/**/*.ts"],
       "rules": {

assets/single-use-form.ts

@@ -1,7 +1,5 @@
 import { disableButton, getLang } from './dom.js'
-import { DefaultLocale, isSupportedLocale } from './locales/index.js'
-
-const translateDep = import('./locales/index.js')
+import { DefaultLocale, isSupportedLocale, translate } from './locales/index.js'
 
 export class SingleUseForm extends HTMLElement {
   static element = 'single-use-form' as const
@@ -12,7 +10,7 @@ export class SingleUseForm extends HTMLElement {
     this.addEventListener('submit', this.onSubmit)
   }
 
-  private onSubmit = async (event: SubmitEvent) => {
+  private onSubmit = (event: SubmitEvent) => {
     const form = event.target
     if (!(form instanceof HTMLFormElement)) {
       return
@@ -21,8 +19,6 @@ export class SingleUseForm extends HTMLElement {
     if (form.dataset['submitted'] === 'true') {
       event.preventDefault()
     } else {
-      const { translate } = await translateDep
-
       const lang = getLang(this)
       const locale = isSupportedLocale(lang) ? lang : DefaultLocale