Add react-i18next for multi-language support (#917)

This is a rough start on adding react-i18next. I'll be working on adding
more translatable strings and translations in the coming days. I'm going
to need to wrap class components in HOCs, so let me know if there's
something I should be fixing before doing that. I'm thinking now to keep
the exported class names exactly the same, and rename the existing
classes by prefixing an `I` (for internal). For example:

```
export default class AppToolbar ...
```

becomes

```
class IAppToolbar ...
const AppToolbar = withTranslation()(IAppToolbar);
export default AppToolbar;
```

I'll be able to contribute Japanese strings (I've talked to a couple
people on my team and they'll be happy to help as well), so that's the
language I decided to go with in this PR.

Closes #746

---------

Co-authored-by: Ko Nagase <nagase@georepublic.co.jp>
Co-authored-by: Harel M <harel.mazor@gmail.com>

package.json

@@ -7,6 +7,7 @@
   "scripts": {
     "start": "vite",
     "build": "tsc && vite build --base=/maputnik/",
+    "i18n:refresh": "i18next 'src/**/*.{ts,tsx,js,jsx}'",
     "lint": "eslint ./src ./cypress --ext ts,tsx,js,jsx --report-unused-disable-directives --max-warnings 0",
     "test": "cypress run",
     "cy:open": "cypress open",
@@ -38,6 +39,9 @@
     "detect-browser": "^5.3.0",
     "events": "^3.3.0",
     "file-saver": "^2.0.5",
+    "i18next": "^23.12.2",
+    "i18next-browser-languagedetector": "^8.0.0",
+    "i18next-resources-to-backend": "^1.2.1",
     "json-stringify-pretty-compact": "^4.0.0",
     "json-to-ast": "^2.1.0",
     "jsonlint": "github:josdejong/jsonlint#85a19d7",
@@ -63,6 +67,7 @@
     "react-color": "^2.19.3",
     "react-dom": "^18.2.0",
     "react-file-reader-input": "^2.0.0",
+    "react-i18next": "^15.0.1",
     "react-icon-base": "^2.1.2",
     "react-icons": "^5.0.1",
     "react-sortable-hoc": "^2.0.0",
@@ -121,11 +126,12 @@
     "@types/uuid": "^9.0.8",
     "@vitejs/plugin-react": "^4.2.1",
     "cors": "^2.8.5",
-    "cypress": "^13.10.0",
+    "cypress": "^13.13.0",
     "eslint": "^8.57.0",
     "eslint-plugin-react": "^7.34.1",
     "eslint-plugin-react-hooks": "^4.6.0",
     "eslint-plugin-react-refresh": "^0.4.6",
+    "i18next-parser": "^9.0.1",
     "istanbul": "^0.4.5",
     "istanbul-lib-coverage": "^3.2.2",
     "mocha": "^10.3.0",