Open the composer full screen, as a setting (#401) (#404)

Settings > General > Composing has a new switch, "Open the composer full
screen". With it on, every new composer, whether a new message, reply,
forward or reopened draft, starts maximized. Restore still shrinks it to
a window. A draft put back after an undone or failed send keeps the size
it had. It's off by default, and on a phone, where the composer already
fills the screen, it changes nothing.

One new string, translated in all nine catalogs. The count falling back
to English stays at 16 in every language.

Fixes #401

web/src/locales/es.ts

@@ -749,6 +749,7 @@ export const catalog: Catalog = {
     "Attachment reminder": "Aviso de adjunto",
     "Warn when the message mentions an attachment but none is attached.": "Avisar cuando el mensaje menciona un adjunto pero no hay ninguno.",
     "Spell check while typing": "Corrección ortográfica al escribir",
+    "Open the composer full screen": "Redactar mensajes a pantalla completa",
     "Confirm before deleting": "Confirmar antes de eliminar",
     "Show message snippets": "Mostrar un fragmento de los mensajes",
     "Preview the first line of each message in the list.": "Mostrar la primera línea de cada mensaje en la lista.",