fix: i18n help introduction hero — badges + stat labels

- 5 feature tag badges: data-i18n on span.help-badge
- 3 stat labels: Experience, Search → English
- Access label fixed with dedicated key
- All EN translations provided

frontend/locales/en.json

@@ -649,9 +649,9 @@
   "help.welcome_title": "Welcome to ObsiGate",
   "help.welcome_desc": "ObsiGate is your web gateway to your Obsidian vaults. Access, browse, and search all your notes from any device via a modern and responsive interface.",
   "help.welcome_tag1": "⚡ Fast navigation",
-  "help.welcome_tag2": "📁 Multi-vault",
+  "help.welcome_tag2": "🗂️ Multi-vault",
   "help.welcome_tag3": "🏷️ Smart tags",
-  "help.welcome_tag4": "📖 Reading & editing",
+  "help.welcome_tag4": "📝 Reading & editing",
   "help.welcome_tag5": "🔍 TF-IDF search",
   "about.subtitle": "Your Obsidian notes, simply accessible.",
   "about.built_with": "BUILT WITH",
@@ -934,5 +934,6 @@
   "help.desc_tag_suggest": ": Tag suggestions with counters",
   "help.desc_chip_view": ": See active filters at a glance",
   "help.desc_chip_remove": ": Click \"×\" to remove a filter",
-  "help.desc_facet_vaults": ": Counters by vault"
+  "help.desc_facet_vaults": ": Counters by vault",
+  "help.access": "Access"
 }

frontend/locales/fr.json

@@ -934,5 +934,6 @@
   "help.desc_tag_suggest": ": Suggestions de tags avec compteurs",
   "help.desc_chip_view": ": Voir d'un coup d'œil les filtres actifs",
   "help.desc_chip_remove": ": Cliquez sur \"×\" pour retirer un filtre",
-  "help.desc_facet_vaults": ": Compteurs par vault"
+  "help.desc_facet_vaults": ": Compteurs par vault",
+  "help.access": "Accès"
 }