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/en.ts

@@ -1618,6 +1618,10 @@ export const en = {
           sheetTitle: "Append system prompt",
           accessibilityLabel: "Append system prompt",
           placeholder: "Always keep replies concise.",
+          edit: "Edit",
+          reset: "Reset",
+          save: "Save",
+          saving: "Saving...",
         },
       },
       agents: {
@@ -1631,10 +1635,12 @@ export const en = {
           editLabel: "Edit label",
           title: "Rename host",
           placeholder: "My Host",
+          submit: "Rename",
         },
         restart: {
           title: "Restart daemon",
           hint: "Restarts the daemon process. The app will reconnect automatically",
+          confirm: "Restart",
           confirmTitle: "Restart {{name}}",
           confirmMessage:
             "This will restart the daemon. Agents running on it will keep going; the app will reconnect automatically.",