[REF] *: Unify _t and _lt

The goal of this commit is to prepare ground to remove
lazytranslate function _lt() and keep only _t()
for a better understanding of the use of the translation function.

In this commit,

the translate function _t() has been updated to return the translation
if they are loaded. If not, it throws an error.
the lazytranslate function _lt() returns _t() function.
Corollaries :
Steps in test tours are now a function that returns an array of steps
to avoid any interpolation of _t in this ones before translations has
been loaded.

Example :

registry.category("web_tour.tours").add("example", {
    test: true,
    steps: () => [
        {...},
        {...},
    ],
});

task-3292454

closes odoo/odoo#124157

Related: odoo/enterprise#43153
Signed-off-by: Samuel Degueldre (sad) <sad@odoo.com>

addons/hr/static/tests/tours/hr_employee_flow.js

@@ -6,7 +6,7 @@ import { stepUtils } from "@web_tour/tour_service/tour_utils";
 registry.category("web_tour.tours").add('hr_employee_tour', {
     test: true,
     url: '/web',
-    steps: [
+    steps: () => [
     stepUtils.showAppsMenuItem(),
     {
         content: "Open Employees app",

addons/hr/static/tests/tours/user_modify_own_profile_tour.js

@@ -2,19 +2,30 @@
 
 import { stepUtils } from "@web_tour/tour_service/tour_utils";
 import { registry } from "@web/core/registry";
+import { patch } from "@web/core/utils/patch";
 
 /**
  * As 'hr' changes the flow a bit and displays the user preferences form in a full view instead of
  * a modal, we adapt the steps of the original tour accordingly.
  */
-registry.category("web_tour.tours").get('mail/static/tests/tours/user_modify_own_profile_tour.js').steps = [{
-    content: 'Open user account menu',
-    trigger: '.o_user_menu button',
-}, {
-    content: "Open preferences / profile screen",
-    trigger: '[data-menu=settings]',
-}, {
-    content: "Update the email address",
-    trigger: 'div[name="email"] input',
-    run: 'text updatedemail@example.com',
-}, ...stepUtils.saveForm()];
+patch(registry.category("web_tour.tours").get("mail/static/tests/tours/user_modify_own_profile_tour.js"), "patch_user_modify_own_profile_tour", {
+    steps() {
+        return [
+            {
+                content: 'Open user account menu',
+                trigger: '.o_user_menu button',
+            }, 
+            {
+                content: "Open preferences / profile screen",
+                trigger: '[data-menu=settings]',
+            }, 
+            {
+                content: "Update the email address",
+                trigger: 'div[name="email"] input',
+                run: 'text updatedemail@example.com',
+            }, 
+            ...stepUtils.saveForm(),
+        ];
+    }
+});
+