Fix non-8bit string export problem

package.json

@@ -38,6 +38,7 @@
     "punycode.js": "2.1.0",
     "qrcode": "1",
     "ruffle-mirror": "2021.12.31",
+    "utf8": "^3.0.0",
     "vue": "^3.2.31",
     "vue-i18n": "^9.2.0-beta.34",
     "vue-router": "4.0.14",

src/services/export_import/export_import.js

@@ -1,9 +1,11 @@
+import utf8 from 'utf8'
+
 export const newExporter = ({
   filename = 'data',
   getExportedObject
 }) => ({
   exportData () {
-    const stringified = JSON.stringify(getExportedObject(), null, 2) // Pretty-print and indent with 2 spaces
+    const stringified = utf8.encode(JSON.stringify(getExportedObject(), null, 2)) // Pretty-print and indent with 2 spaces
 
     // Create an invisible link with a data url and simulate a click
     const e = document.createElement('a')

yarn.lock

@@ -10065,6 +10065,11 @@ use@^3.1.0:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/use/-/use-3.1.1.tgz#d50c8cac79a19fbc20f2911f56eb973f4e10070f"
 
+utf8@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/utf8/-/utf8-3.0.0.tgz#f052eed1364d696e769ef058b183df88c87f69d1"
+  integrity sha512-E8VjFIQ/TyQgp+TZfS6l8yp/xWppSAHzidGiRrqe4bK4XP9pTRyKFgGJpO3SN7zdX4DeomTrwaseCHovfpFcqQ==
+
 util-deprecate@^1.0.1, util-deprecate@^1.0.2, util-deprecate@~1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"