fix: Add missing activity type translations

Added translations for all activity types:
- growth: Growth
- medication: Medication
- medicine: Medicine
- temperature: Temperature
- activity: Activity

This fixes the 'activityTypes.medicine: 1' label display issue
on the insights page where translation keys were showing instead
of translated text.

File Changed:
- locales/en/insights.json

Co-Authored-By: Claude <noreply@anthropic.com>

maternal-web/locales/en/insights.json

@@ -58,8 +58,12 @@
     "feeding": "Feeding",
     "sleep": "Sleep",
     "diaper": "Diaper",
+    "growth": "Growth",
     "medication": "Medication",
+    "medicine": "Medicine",
+    "temperature": "Temperature",
     "milestone": "Milestone",
+    "activity": "Activity",
     "note": "Note",
     "none": "None"
   },