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All error messages in Madata are localizable. Each Backend subclass includes the phrases it may need under the static phrases property.

For example, from oauth-backend.js:

static phrases = {
	"popup_blocked": "Login popup was blocked! Please check your popup blocker settings.",
	"something_went_wrong_while_connecting": name => "Something went wrong while connecting to " + name,

The object key is the id of the phrase (not changed) and the value is either a string with the phrase (if there are no parameters) or a function that takes any relevant variables and returns a string. You can simply modify this object to localize them to a single language. If your app needs to support multiple languages, you can implement logic that swaps in one phrase object for another.