Translate English built from template literals in attributes

i18n-literals now flags a template literal in a UI attribute or prop when
there are words between its values: `Remove ${email}`, `${name} — shared by
${owner}`. It cannot be a catalogue key as written, so neither the key
exemption nor the sentence-shape test applies. A template that is only
punctuation around values, like `${name} (${size})`, is left alone.

The twelve it found are now keys with placeholders: the quota bar title,
the address menu's label, a folder's subfolder unread count, a recipient
chip's remove button, the contact editor's title, shared and available
calendars and address books, the date and time fields' labels, the
attachment title's fallback name, and the free/busy bar. The bar showed
the raw JMAP busyStatus ("confirmed") and now says Busy, Tentative or
Unavailable.

11 new keys in all nine catalogues. Remove {address}, Date, Time, Busy and
Tentative already existed.

web/src/views/AppShell.tsx

@@ -365,7 +365,7 @@ function QuotaBar() {
   if (!q || !q.hardLimit) return null;
   const pct = Math.min(100, Math.round((q.used / q.hardLimit) * 100));
   return (
-    <div className="quota" title={`${formatSize(q.used)} of ${formatSize(q.hardLimit)} used`}>
+    <div className="quota" title={t("{used} of {total} used", { used: formatSize(q.used), total: formatSize(q.hardLimit) })}>
       <div className="row" style={{ justifyContent: "space-between" }}>
         <span>
           {t("{used} of {total}", { used: formatSize(q.used), total: formatSize(q.hardLimit) })}