Settings: language and theme, kept in the app

Appearance in Settings chooses the language (the system's, or one of the nine the app has;
the window opens again in it, its replies and shells let go first) and the theme (the
account's, or Moria or Shire, drawn at once and the window painted in it). Kept in
localStorage on this computer: /api/v2 has no PATCH /me for either yet, so the account's
own stay as they are. i18n.js reads the choice and carries each language's own name from
the server's catalogue. Tests E5.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -16,6 +16,14 @@ All notable changes to LLeMbas Desktop. The format follows
   the account has another computer linked, a chip before the folder chooses it (this computer is
   the default). Its folder is one its agent chats have worked in, or a path typed in; the Terminal
   before the first message opens there too.
+- **Language and theme in Settings.** Under Appearance: the language (this computer's, or any of
+  the app's nine; the window opens again in it) and the theme (the account's, or Moria or Shire).
+  Both are kept in the app on this computer; the account's own stay as they are.
+
+### Fixed
+
+- **A terminal that ended could come back by itself.** Shown again and ended by the server within
+  one frame, the panel opened a new shell in its place; an ended shell is now only said.
 
 ## [1.0.0-beta.6] — 2026-11-10