fix(devices): unicode escape bug + onSuccess race + en locale + apiErr surface

Code-review follow-up on 321c65b.

- prettier ate the raw glyphs (✓/✕/✏️) in AdminUserDetail.tsx and emitted
  \u2713 / \u2715 / \u270F\uFE0F as JSX text children. JSX does NOT
  process \u… escapes inside element children, so admin users saw the
  literal six-character strings on Save/Cancel/Rename buttons. Wrap each
  glyph in a JS expression {'…'} so it survives both prettier and JSX.
- renameDeviceMutation.onSuccess on Subscription.tsx no longer
  unconditionally clears the edit state. If the user already navigated
  to a different device while the previous save was in flight, we keep
  their in-progress input. Same shape applied to AdminUserDetail.tsx —
  the alias is snapshot before the await so a race can't smuggle the
  wrong value into the request, and the post-success reset is guarded.
- AdminUserDetail rename error path now surfaces the backend's
  response.data.detail (e.g. '64-char limit' message) instead of the
  generic localized userActions.error toast.
- Add the new rename i18n keys to src/locales/en.json so English users
  no longer fall back to Russian labels. ua/zh/fa to follow in a
  dedicated translation pass.

src/pages/Subscription.tsx

@@ -318,10 +318,13 @@ export default function Subscription() {
   const renameDeviceMutation = useMutation({
     mutationFn: ({ hwid, name }: { hwid: string; name: string | null }) =>
       subscriptionApi.renameDevice(hwid, name, subscriptionId),
-    onSuccess: () => {
+    onSuccess: (_data, variables) => {
       queryClient.invalidateQueries({ queryKey: ['devices', subscriptionId] });
-      setEditingDeviceHwid(null);
-      setEditingDeviceName('');
+      // Не сбрасываем edit-state, если пользователь уже перешёл на другой
+      // девайс пока шёл запрос — иначе теряем его новый input. Имя не чистим
+      // безусловно: оно либо принадлежит уже другому девайсу (нужно сохранить),
+      // либо инпут уже закрылся (значение не отображается).
+      setEditingDeviceHwid((current) => (current === variables.hwid ? null : current));
     },
   });