fix(i18n): remove unused health_score.loading key from all locales

Author: hamdibenjarrar

i18n/locales/ar-EG.json

@@ -226,7 +226,6 @@
     },
     "health_score": {
       "title": "درجة الصحة",
-      "loading": "جارِ تحليل صحة الحزمة...",
       "error": "تعذّر تحميل درجة الصحة",
       "score_tooltip": "درجة صحة الحزمة الإجمالية (0-100) مدعومة من npm Pulse",
       "grade_tooltip": "تقدير الصحة: {grade}",

i18n/locales/en.json

@@ -648,7 +648,6 @@
     },
     "health_score": {
       "dimensions_label": "Health score dimensions",
-      "loading": "Analyzing package health...",
       "grade_tooltip": "Health grade: {grade}",
       "dimension_maintenance": "Maintenance",
       "powered_by": "npm Pulse",

i18n/locales/fr-FR.json

@@ -648,7 +648,6 @@
     },
     "health_score": {
       "title": "Score de santé",
-      "loading": "Analyse de la santé du paquet...",
       "error": "Impossible de charger le score de santé",
       "score_tooltip": "Score de santé global du paquet (0-100) propulsé par npm Pulse",
       "grade_tooltip": "Note de santé : {grade}",