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/en.json

@@ -974,5 +974,15 @@
   "help.desc_graph_nav": ": Navigation history between nodes",
   "help.desc_edges": ": Outgoing wikilinks (blue) and incoming backlinks (green)",
   "help.desc_fullscreen": ": Button to expand the view",
-  "help.desc_export_png": ": Save the graph as an image"
+  "help.desc_export_png": ": Save the graph as an image",
+  "help.graph_zoom": "Zoom/Pan",
+  "help.graph_depth": "Depth slider",
+  "help.graph_tag_filter": "Filter by tag",
+  "help.graph_type_filter": "Filter by type",
+  "help.graph_visual": "Visual search",
+  "help.graph_nav_arrows": "Navigation ← → ↑",
+  "help.graph_nodes": "Nodes",
+  "help.graph_info": "Info panel",
+  "help.graph_export": "Export PNG",
+  "help.graph_context": "Context menu"
 }