feat: stack related date fields and clarify share stock labels (#422)

* feat: stack related date fields and clarify share stock labels

* test: cover stacked date pairs and share labels

frontend/src/i18n/de.json

@@ -585,14 +585,14 @@
       "name": "Name",
       "package": "Packung",
       "stock": "Bestand",
-      "daysLeft": "Tage übrig",
+      "daysLeft": "Geschätzte Resttage",
       "nextIntake": "Nächste Einnahme",
       "depletion": "Aufgebraucht",
-      "priority": "Priorität"
+      "priority": "Bestandswarnung"
     },
     "priority": {
-      "normal": "Normal",
-      "high": "Hoch"
+      "normal": "Bestand ok",
+      "high": "Niedriger Bestand"
     },
     "stock": {
       "of": "{{current}} von {{capacity}}"

frontend/src/i18n/en.json

@@ -585,14 +585,14 @@
       "name": "Name",
       "package": "Package",
       "stock": "Stock",
-      "daysLeft": "Days left",
+      "daysLeft": "Estimated days left",
       "nextIntake": "Next intake",
       "depletion": "Depletion",
-      "priority": "Priority"
+      "priority": "Stock alert"
     },
     "priority": {
-      "normal": "Normal",
-      "high": "High"
+      "normal": "Stock OK",
+      "high": "Low stock"
     },
     "stock": {
       "of": "{{current}} of {{capacity}}"