Rewards extension popup doesn't display translated strings on linux with dist executable

[simonhong]

On local, executing brave in src/out/Release/dist, rewards popup doesn't show translated string.

Below is the result with korean locale.

[simonhong]

i18n: xxxx is displayed because chrome.i18n.getMessage() returns null.

export const getMessage = (message: string, substitutions?: string[]): string => {
  if (chrome.i18n) {
    let translated = chrome.i18n.getMessage(message, substitutions)

    if (translated) {
      return translated
    } else {
      return `i18n: ${message}`
    }
  }

  return `i18n missing: ${message}`
}

[simonhong]

Duplicated issue with #1555.

[srirambv]

Marking QA/No as its duplicated with #1555 which is on verification list.