feat(entry): County, CQ, ITU and DXCC on the freed row

Comment and Note moving onto one line left the right column two rows shorter
than the left, and this fills it: county, both zones and the ADIF entity
number. All four are filled by the lookup and were only visible after opening a
tab — the wrong place for values an operator wants to SEE are right before
pressing Log.

County is a name, not a code ("St. Tammany Parish"), so it takes the flexible
width and the three numbers get fixed narrow boxes.

Cleared numeric fields store undefined, not 0. Zero is a real DXCC number and a
real zone, so an empty box has to stay empty rather than assert something the
operator did not type.

State stays up on the geography line beside QTH and the locator, which is how
the lookup fills them and how they are read.

changelog.json

@@ -6,13 +6,13 @@
       "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.",
       "Call lookup: QRZ.com now fills Name with the first name only, and optionally with the operator nickname instead.",
-      "Entry form: Name, Band, Mode and Country are narrower, and a State field sits between QTH and the locator."
+      "Entry form: a narrower left column, State beside the locator, and a new line with County, CQ, ITU and DXCC."
     ],
     "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.",
       "Recherche d indicatif : QRZ.com remplit désormais Nom avec le seul prénom, et au choix avec le surnom de l opérateur.",
-      "Saisie : Nom, Bande, Mode et Pays sont plus étroits, et un champ État s intercale entre QTH et le locator."
+      "Saisie : colonne de gauche plus étroite, État à côté du locator, et une nouvelle ligne Comté, CQ, ITU et DXCC."
     ]
   },
   {