Internationalization: Mark up PlaylistEditPage for translations (#74455)

* PlaylistEdit Page i18n

* Update public/app/features/playlist/PlaylistEditPage.tsx

Co-authored-by: Ashley Harrison <ashharrison90@gmail.com>

* Update public/app/features/playlist/PlaylistEditPage.tsx

Co-authored-by: Ashley Harrison <ashharrison90@gmail.com>

* PlaylistForm

* more changes

* PlaylistForm

* PlaylistForm

* Update public/app/features/playlist/PlaylistEditPage.tsx

Co-authored-by: Ashley Harrison <ashharrison90@gmail.com>

* Update public/app/features/playlist/PlaylistEditPage.tsx

Co-authored-by: Ashley Harrison <ashharrison90@gmail.com>

* Update PlaylistForm.tsx

* Update Add- labels

* couple of missed keys

---------

Co-authored-by: Ashley Harrison <ashharrison90@gmail.com>
Co-authored-by: Ashley Harrison <ashley.harrison@grafana.com>

public/locales/fr-FR/grafana.json

@@ -613,6 +613,29 @@
       "view": "Afficher"
     }
   },
+  "playlist-edit": {
+    "error-prefix": "",
+    "form": {
+      "add-tag-label": "",
+      "add-tag-placeholder": "",
+      "add-title-label": "",
+      "cancel": "",
+      "heading": "",
+      "interval-label": "",
+      "interval-placeholder": "",
+      "interval-required": "",
+      "name-label": "",
+      "name-placeholder": "",
+      "name-required": "",
+      "save": "",
+      "table-delete": "",
+      "table-drag": "",
+      "table-empty": "",
+      "table-heading": ""
+    },
+    "sub-title": "",
+    "title": ""
+  },
   "refresh-picker": {
     "aria-label": {
       "choose-interval": "Actualisation automatique désactivée. Choisir un intervalle de temps d'actualisation",