feat(lookup): optional QRZ nickname as the logged name

QRZ publishes <nickname> — the name an operator goes BY on the air — and
OpsLog was composing fname + name instead. "Bob" is what belongs in a log;
"Robert J Smith" is what belongs on a licence.

QRZ only, and deliberately so: HamQTH's <nick> already fills the Name field
that way, so the same switch there would toggle a behaviour it has no way to
turn off.

A published nickname is optional, so an empty one falls through to the
registered name. That is the whole point of it being a fallback rather than a
swap, and it is what the test pins — a blank nickname must never blank the
name.

changelog.json

@@ -4,11 +4,13 @@
     "date": "",
     "en": [
       "Cluster: \"Hide worked\" no longer hides a spot that is a new prefix, county, grid or park in an entity already worked.",
-      "DX Cluster: a spot lifetime can be set — 5, 10, 15 minutes or your own value — after which spots leave the list and the band maps."
+      "DX Cluster: a spot lifetime can be set — 5, 10, 15 minutes or your own value — after which spots leave the list and the band maps.",
+      "Call lookup: an option makes QRZ.com use the operator nickname as the name, falling back to the full name when none is published."
     ],
     "fr": [
       "Cluster : « Masquer les contactés » ne masque plus un spot qui est un nouveau préfixe, comté, carré ou parc dans une contrée déjà faite.",
-      "Cluster DX : on peut fixer une durée de vie des spots — 5, 10, 15 minutes ou une valeur libre — au-delà de laquelle ils quittent la liste et les band maps."
+      "Cluster DX : on peut fixer une durée de vie des spots — 5, 10, 15 minutes ou une valeur libre — au-delà de laquelle ils quittent la liste et les band maps.",
+      "Recherche d indicatif : une option fait utiliser à QRZ.com le surnom de l opérateur comme nom, avec repli sur le nom complet s il n y en a pas."
     ]
   },
   {