fix(app): add missing i18n keys for host settings (#1478)

* fix(app): add missing i18n keys for host settings

The client UI i18n migration (#1282) referenced translation keys that
were never added to any locale file, so i18next rendered the raw key
string in Settings → Host (e.g. a button labeled
"settings.host.daemon.restart.confirm").

Add the six missing keys to all six locales with real translations:
- settings.host.daemon.rename.submit
- settings.host.daemon.restart.confirm
- settings.host.orchestration.systemPrompt.{edit,reset,save,saving}

The seventh broken reference, in pair-device-modal.tsx, used the wrong
namespace (settings.integrations.pairDevices.rowTitle); the key is
defined at settings.host.pairDevices.rowTitle. Point the reference there.

Reported in https://github.com/getpaseo/paseo/pull/1282#issuecomment-4686672699

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(app): correct machine-translated Save/Saving labels (es/fr/ar)

#1282 left several Save/Saving labels machine-translated into the
"economize money" sense rather than the persist-data sense, so users saw
"Ahorro..." (es), "Économie..." (fr), and "توفير..." (ar) where "Saving..."
was meant.

Fix renameModal.saving and settings.project.actions.{save,saving} in the
three affected locales. ar's actions.save also moves from the conjugated
"يحفظ" to the standard button form "حفظ". Wording matches each locale's
already-correct siblings (e.g. es "Proyecto guardado") and the keys added
in the previous commit. ru and zh-CN were already correct and are untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/app/src/i18n/resources/fr.ts

@@ -1332,7 +1332,7 @@ export const fr: TranslationResources = {
   },
   renameModal: {
     rename: "Rebaptiser",
-    saving: "Économie...",
+    saving: "Sauvegarde...",
   },
   sidebarCallout: {
     dismiss: "Rejeter",
@@ -1654,6 +1654,10 @@ export const fr: TranslationResources = {
           sheetTitle: "Ajouter une invite système",
           accessibilityLabel: "Ajouter une invite système",
           placeholder: "Gardez toujours des réponses concises.",
+          edit: "Modifier",
+          reset: "Réinitialiser",
+          save: "Sauvegarder",
+          saving: "Sauvegarde...",
         },
       },
       agents: {
@@ -1667,10 +1671,12 @@ export const fr: TranslationResources = {
           editLabel: "Modifier l'étiquette",
           title: "Renommer l'hôte",
           placeholder: "MonHost",
+          submit: "Renommer",
         },
         restart: {
           title: "Redémarrer le démon",
           hint: "Redémarre le processus démon. L'application se reconnectera automatiquement",
+          confirm: "Redémarrer",
           confirmTitle: "Redémarrer{{name}}",
           confirmMessage:
             "Cela redémarrera le démon. Les agents qui s'y exécutent continueront à fonctionner; l'application se reconnectera automatiquement.",
@@ -1844,7 +1850,7 @@ export const fr: TranslationResources = {
         tryAgain: "Essayer à nouveau",
         save: "Sauvegarder",
         saved: "Projet enregistré",
-        saving: "Économie...",
+        saving: "Sauvegarde...",
         cancel: "Annuler",
       },
     },