fix(icom): say when a radio has no scope stream instead of drawing nothing

The CI-V trace settles it: the IC-7851 answers 27 10 01 with FB and 27 14 00
with its mode, but refuses 27 11 in BOTH shapes — it controls its scope over
CI-V and never streams it. Its last firmware is from 2016, older than the
waveform stream itself; Hamlib's caps claim otherwise, the radio is the
authority.

Rejected both ways is a permanent answer, so it is remembered and reported:
the panadapter says the radio does not send its scope, which is the one thing a
black rectangle could not say.

frontend/src/lib/i18n.tsx

@@ -127,6 +127,7 @@ const en: Dict = {
   'mx.tipCallConf': 'This callsign confirmed', 'mx.tipCallWork': 'This callsign worked (not confirmed)',
   'mx.tipDxConf': 'Entity confirmed (other callsign)', 'mx.tipDxWork': 'Entity worked (other callsign)',
   'mx.tipNone': 'Never worked', 'mx.tipClick': 'click to list the QSOs',
+  'icmp.scopeNoStream': 'This radio does not send its scope over CI-V — its own screen still works.',
   'mx.markWork': 'This callsign worked', 'mx.markConf': 'This callsign confirmed',
   'mx.tipThisCall': 'already worked with this callsign',
   'mx.tipThisCallConf': 'already confirmed with this callsign',
@@ -616,6 +617,7 @@ const fr: Dict = {
   'mx.tipCallConf': 'Cet indicatif est confirmé', 'mx.tipCallWork': 'Cet indicatif est contacté (non confirmé)',
   'mx.tipDxConf': 'Entité confirmée (autre indicatif)', 'mx.tipDxWork': 'Entité contactée (autre indicatif)',
   'mx.tipNone': 'Jamais contacté', 'mx.tipClick': 'cliquer pour lister les QSO',
+  'icmp.scopeNoStream': "Cette radio n'envoie pas son scope en CI-V — son propre écran fonctionne toujours.",
   'mx.markWork': 'Cet indicatif contacté', 'mx.markConf': 'Cet indicatif confirmé',
   'mx.tipThisCall': 'déjà contacté avec cet indicatif',
   'mx.tipThisCallConf': 'déjà confirmé avec cet indicatif',