feat(next): l10n: Update payments-next logic to use payments-next.ftl

Because:

* payments-next no longer needs to rely on payments translations, as payments-next translations are completed.

This commit:

* Removes the dependency on payments.ftl translations within payments-next project.json and gruntfile.js

Closes #FXA-7841

apps/payments/next/Gruntfile.js

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-module.exports = function(grunt) {
+module.exports = function (grunt) {
   const srcPaths = [
     '.license.header',
     'app/**/*.ftl',
@@ -26,10 +26,6 @@ module.exports = function(grunt) {
         src: srcPaths,
         dest: 'public/locales/en/payments-next.ftl',
       },
-      ftlLegacy: {
-        src: srcPaths,
-        dest: 'public/locales/en/payments.ftl',
-      },
     },
     http: {
       // Call the Payments Next route to restart and reinitialize the Nest App.
@@ -76,6 +72,9 @@ module.exports = function(grunt) {
   grunt.loadNpmTasks('grunt-http');
   grunt.loadNpmTasks('grunt-concurrent');
 
-  grunt.registerTask('merge-ftl', ['copy:branding-ftl', 'concat:ftl', 'concat:ftlLegacy']);
+  grunt.registerTask('merge-ftl', [
+    'copy:branding-ftl',
+    'concat:ftl'
+  ]);
   grunt.registerTask('watchers', ['concurrent:dev']);
 };

apps/payments/next/project.json

@@ -56,7 +56,7 @@
     },
     "l10n-bundle": {
       "dependsOn": ["l10n-merge"],
-      "command": "./_scripts/l10n/bundle.sh apps/payments/next branding,react,payments"
+      "command": "./_scripts/l10n/bundle.sh apps/payments/next branding,react,payments-next"
     },
     "watchers": {
       "command": "yarn grunt --gruntfile='apps/payments/next/Gruntfile.js' watchers"