feat: implement internationalization support by updating locale files and adding language switch component

package-lock.json

@@ -19,6 +19,7 @@
       "devDependencies": {
         "@eslint/eslintrc": "^3",
         "@tailwindcss/postcss": "^4",
+        "@types/leaflet": "^1.9.18",
         "@types/node": "^20",
         "@types/react": "^19",
         "@types/react-dom": "^19",
@@ -1289,6 +1290,12 @@
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       "dev": true
     },
+    "node_modules/@types/geojson": {
+      "version": "7946.0.16",
+      "resolved": "https://registry.npmjs.org/@types/geojson/-/geojson-7946.0.16.tgz",
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     "node_modules/@types/json-schema": {
       "version": "7.0.15",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.15.tgz",
@@ -1301,6 +1308,15 @@
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+    "node_modules/@types/leaflet": {
+      "version": "1.9.18",
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+      "dev": true,
+      "dependencies": {
+        "@types/geojson": "*"
+      }
+    },
     "node_modules/@types/node": {
       "version": "20.17.57",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-20.17.57.tgz",