fix: tag + translate all help body headings and paragraphs

- 36 new data-i18n tags on h2/h3/p in help modal body
- Fixed concatenated attributes (pdata-i18n → p data-i18n)
- All section headings translated (Palette, AI Editor, Search, etc.)
- 827 locale keys total, 354 data-i18n attributes
- Help guide title 'Guide utilisation ObsiGate' now translated

frontend/locales/en.json

@@ -792,5 +792,41 @@
   "help.00b9572b": "Results ranked by TF-IDF relevance",
   "help.a4a4e21b": "\"×\" button to reset the filter",
   "help.04df1506": "Global search with autocomplete",
-  "help.d5c977ac": "Code blocks adapt to the theme"
+  "help.d5c977ac": "Code blocks adapt to the theme",
+  "help.733f0559": "🗺️ Navigation",
+  "help.8c5341e0": "📑 Tab management",
+  "help.adf30d78": "🔍 Recherche",
+  "help.a648c49e": "Facets and sorting",
+  "help.2507242f": "🏷️ Tags",
+  "help.5f87ea79": "Tag cloud",
+  "help.2c03a7ba": "Inline vs frontmatter tags",
+  "help.63f024d4": "Template tag filtering",
+  "help.c017944b": "📄 Fichiers",
+  "help.cf8615b1": "Visualization",
+  "help.9c7a0a8d": "🗺️ Graph View",
+  "help.b6619ac9": "Opening",
+  "help.61ee5a22": "Interaction",
+  "help.8caed987": "Display",
+  "help.86e3825d": "🎨 Customization",
+  "help.7bcbb2e3": "Sidebar resizing",
+  "help.62308f96": "⌨️ Command Palette",
+  "help.6d547397": "File mode",
+  "help.3cf370b1": "Command mode",
+  "help.2a2e5b0f": "⌨️ Keyboard shortcuts",
+  "help.096367af": "Visual indicators",
+  "help.2dad2bfd": "Automatic save",
+  "help.8c65b2f2": "🔗 Sharing and Webhooks",
+  "help.29afa01d": "🪝 Webhooks",
+  "help.77f4f06e": "Payload format",
+  "help.550b0240": "Concrete examples",
+  "help.d1ea1dc6": "n8n / Make (no-code)",
+  "help.229fd3e2": "Discord notification",
+  "help.40dd7e38": "Test with curl",
+  "help.381abec7": "Current limitations",
+  "help.62549eca": "💾 Backups and Audits",
+  "help.c48fb18a": "Authentication",
+  "help.83f1d9ca": "Protection",
+  "help.686f8313": "💡 Tips and best practices",
+  "help.fe388b67": "Optimizations",
+  "help.2a92203f": "Tips and tricks"
 }