i18n(voice): use a label for the imagery area line

"Over {area}" put a country name straight after a preposition, which drops
the article Italian, Portuguese, Spanish and German need ("Sopra Italia",
"Über Schweiz"). Use the label form French and the "In {area}" line already
use. zh-Hant now says 服務器 like the rest of its catalog.

src/i18n/locales/de.json

@@ -2955,7 +2955,7 @@
   "Not drawn: {parts}": "Nicht gezeichnet: {parts}",
   "approximate": "ungefähr",
   "{pct}% cloud": "{pct} % Bewölkung",
-  "Over {area}": "Über {area}",
+  "Over {area}": "Gebiet: {area}",
   "{count} of {total} acquisitions match": {
     "one": "Passende Aufnahmen: {count} von {total}",
     "other": "Passende Aufnahmen: {count} von {total}"

src/i18n/locales/es.json

@@ -3025,7 +3025,7 @@
   "Not drawn: {parts}": "Sin dibujar: {parts}",
   "approximate": "aproximado",
   "{pct}% cloud": "{pct} % de nubes",
-  "Over {area}": "Sobre {area}",
+  "Over {area}": "Zona: {area}",
   "{count} of {total} acquisitions match": {
     "many": "Adquisiciones coincidentes: {count} de {total}",
     "one": "Adquisiciones coincidentes: {count} de {total}",

src/i18n/locales/it.json

@@ -3025,7 +3025,7 @@
   "Not drawn: {parts}": "Non disegnati: {parts}",
   "approximate": "approssimativo",
   "{pct}% cloud": "{pct}% di nuvole",
-  "Over {area}": "Sopra {area}",
+  "Over {area}": "Zona: {area}",
   "{count} of {total} acquisitions match": {
     "many": "Acquisizioni corrispondenti: {count} su {total}",
     "one": "Acquisizioni corrispondenti: {count} su {total}",

src/i18n/locales/pt.json

@@ -3025,7 +3025,7 @@
   "Not drawn: {parts}": "Não desenhado: {parts}",
   "approximate": "aproximado",
   "{pct}% cloud": "{pct}% de nuvens",
-  "Over {area}": "Sobre {area}",
+  "Over {area}": "Área: {area}",
   "{count} of {total} acquisitions match": {
     "many": "Aquisições correspondentes: {count} de {total}",
     "one": "Aquisições correspondentes: {count} de {total}",

src/i18n/locales/zh-Hant.json

@@ -2874,7 +2874,7 @@
   "UTILITIES": "工具",
   "Exit cockpit to fly to a drawing": "請先退出座艙，再飛往繪製位置",
   "Directions, drawing and your own files": "路線導航、繪製和你自己的文件",
-  "Voice place search (needs an Overpass server)": "語音地點搜索（需要 Overpass 伺服器）",
+  "Voice place search (needs an Overpass server)": "語音地點搜索（需要 Overpass 服務器）",
   "OSM Places": "OSM 地點",
   "state or province": "州或省",
   "county or district": "縣或區",