Check component props for untranslated literals, and fail on a finding

i18n-literals checked title, aria-label, placeholder and alt on elements,
but not the same English passed to a component, so a MenuItem label or a
Popover ariaLabel written as a literal went through. It also excused a
literal that happened to be a catalogue key. That exemption is meant for
English held in a constant and translated where it renders, and a literal
written straight into a JSX attribute has no such render site. No
component passes its props through t(). And neither half of i18n:check
was run with --check, so a finding printed and the script still exited 0.

Component props are checked now, a key no longer excuses a literal in an
attribute, and both scripts run with --check. That found 28 strings
rendering English in every language: 19 already had keys and are wrapped,
and 9 are new keys in all nine catalogues. The contact editor's Save and
Saving… buttons are wrapped as well, on the same line.

web/src/locales/de.ts

@@ -1214,6 +1214,15 @@ export const catalog: Catalog = {
     "Resize panes": "Bereichsgröße ändern",
     "Resize message list": "Größe der Nachrichtenliste ändern",
     "Resize sidebar": "Größe der Seitenleiste ändern",
+    "Hide from list": "Aus der Liste ausblenden",
+    "Show in list": "In der Liste einblenden",
+    "Stop trusting sender images": "Bildern des Absenders nicht mehr vertrauen",
+    "Always show images from sender": "Bilder dieses Absenders immer anzeigen",
+    "Collapse all": "Alle einklappen",
+    "Expand all": "Alle ausklappen",
+    "Send now instead": "Stattdessen jetzt senden",
+    "Switch to plain text": "Zu Nur-Text wechseln",
+    "Switch to rich text": "Zu formatiertem Text wechseln",
     "QR code": "QR-Code",
     "Draft discarded": "Entwurf verworfen",
     "Draft saved": "Entwurf gespeichert",