fix: data-i18n on 10 Graph View strong headings

- Zoom/Pan, Depth slider, Filter by tag, Filter by type
- Visual search, Navigation arrows, Nodes, Info panel, Export PNG
- Context menu
All → EN translations

frontend/locales/fr.json

@@ -974,5 +974,15 @@
   "help.desc_graph_nav": ":\n                                    Historique de navigation entre les nœuds",
   "help.desc_edges": ": Wikilinks sortants\n                                    (bleu) et backlinks entrants (vert)",
   "help.desc_fullscreen": ": Bouton pour\n                                    agrandir la vue",
-  "help.desc_export_png": ": Sauvegardez le\n                                    graphe en image"
+  "help.desc_export_png": ": Sauvegardez le\n                                    graphe en image",
+  "help.graph_zoom": "Zoom/Pan",
+  "help.graph_depth": "Slider de profondeur",
+  "help.graph_tag_filter": "Filtre par tag",
+  "help.graph_type_filter": "Filtre par type",
+  "help.graph_visual": "Recherche visuelle",
+  "help.graph_nav_arrows": "Navigation ← → ↑",
+  "help.graph_nodes": "Nœuds",
+  "help.graph_info": "Panneau d'info",
+  "help.graph_export": "Export PNG",
+  "help.graph_context": "Menu contextuel"
 }