Development build crashes if default language is not en or fr

[warpdesign]

How to reproduce?

• set the OS language to something other than en or fr
• build react-explorer
• run a development build by typing npx electron ./build/main.js

What happens?

The following error is displayed in the console:

Uncaught (in promise) TypeError: Cannot read property 'lang' of undefined
at PrefsDialogClass../src/components/dialogs/PrefsDialog.tsx.PrefsDialogClass.render (PrefsDialog.tsx:241)
at finishClassComponent (react-dom.development.js:17160)
at updateClassComponent (react-dom.development.js:17110)
at beginWork (react-dom.development.js:18620)
at HTMLUnknownElement.callCallback (react-dom.development.js:188)
at Object.invokeGuardedCallbackDev (react-dom.development.js:237)
at invokeGuardedCallback (react-dom.development.js:292)
at beginWork$1 (react-dom.development.js:23203)
at performUnitOfWork (react-dom.development.js:22154)
at workLoopSync (react-dom.development.js:22130)

Also, an empty window is opened.