fix(watchlist): remove on a single click, like the bell and trophy beside it

The two-click arm goes: removing an entry is cheap to undo (type it again), so
it does not earn a confirmation its neighbours do not have. The bin reddens on
hover and the green line confirms the removal.

frontend/src/lib/i18n.tsx

@@ -49,7 +49,7 @@ const en: Dict = {
   'wl.nNeeded': '{n} needed', 'wl.nToday': '{n} today', 'wl.allWorked': 'All worked', 'wl.workedToday': 'Worked today',
   'wl.totalSpots': '{n} spots', 'wl.toggleContest': 'Contest entry: judged per UTC day',
   'wl.notifyOn': 'Alert me when this station is spotted', 'wl.notifyOff': 'Stop alerting for this station',
-  'wl.remove': 'Remove (click twice)', 'wl.noSpots': 'No live spots',
+  'wl.remove': 'Remove', 'wl.removed': '{call} removed from the watchlist.', 'wl.noSpots': 'No live spots',
   'wl.newDxcc': 'NEW DXCC', 'wl.worked': 'Worked', 'wl.needed': 'Needed!', 'wl.todayOk': 'Today ✓', 'wl.workToday': 'Work today!',
   'wl.spotTip': 'Click: fill the callsign · double-click: tune and work',
   'tools.net': 'NET Control', 'tools.alerts': 'Alert management…', 'tools.contest': 'Contest mode',
@@ -573,7 +573,7 @@ const fr: Dict = {
   'wl.nNeeded': '{n} manquants', 'wl.nToday': "{n} aujourd'hui", 'wl.allWorked': 'Tout contacté', 'wl.workedToday': "Contacté aujourd'hui",
   'wl.totalSpots': '{n} spots', 'wl.toggleContest': 'Entrée contest : jugée par jour UTC',
   'wl.notifyOn': "M'alerter quand cette station est spottée", 'wl.notifyOff': "Ne plus alerter pour cette station",
-  'wl.remove': 'Supprimer (cliquer deux fois)', 'wl.noSpots': 'Aucun spot en cours',
+  'wl.remove': 'Supprimer', 'wl.removed': '{call} retiré de la watchlist.', 'wl.noSpots': 'Aucun spot en cours',
   'wl.newDxcc': 'NOUV DXCC', 'wl.worked': 'Contacté', 'wl.needed': 'Manquant !', 'wl.todayOk': "Auj. ✓", 'wl.workToday': "À faire auj. !",
   'wl.spotTip': "Clic : remplir l'indicatif · double-clic : régler la radio et travailler",
   'tools.net': 'Contrôle de NET', 'tools.alerts': 'Gestion des alertes…', 'tools.contest': 'Mode contest',