Map iso-639 language to default iso-3166 country to retrieve country flag

Missing/wrong country flag While adding locales for different languages, I found that some flags are missing.

Version Beta v2.0 WiP 2.0.0-alpha.2 VSCode 1.44.2 Electron: 7.1.11 Chrome: 78.0.3904.130 Node.js: 12.8.1 V8: 7.8.279.23-electron.0 OS: Windows_NT x64 10.0.17763

To Reproduce

1. Add json locale files for en, cs, da, el for example
2. Go to Progress view or i18n Ally Editor or editors popup menu
3. Missing country flags, see screenshots below

Background One cannot just use the first token of the locale to retrieve the countrys flag unfortunatly. For example

• language cs = Czech / country CZ = Czechia
• language da = Danish / country DK = Denmark
• language el = Greek / country GR = Greece
• language en = English / country GB = Great Britain

See

• https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
• https://en.wikipedia.org/wiki/ISO_3166-1

Screenshots

[appleaway]

version: 2.6.9

the flag is not displayed normally

[terales]

@CallMeHunter can you extract it into a new issue, please?