Add Lao (lo-LA) translation

web/locale-labels.json

@@ -55,6 +55,10 @@
     "title": "Open CAD Studio — 웹",
     "loading": "로드 중…"
   },
+  "lo-LA": {
+    "title": "ເວັບແອັບ Open CAD Studio",
+    "loading": "ກຳລັງໂຫຼດ…"
+  },
   "nl-NL": {
     "title": "Open CAD Studio — Web",
     "loading": "Laden…"