Polyglot Translator -> PolyLingo(7/16)

Today I did

- Named the app. PolyLingo.

- Refactor entire codes around the project.

- Minor bug fixes

- Fix code to update usage just for the successfully translated results but not pending or error case.

- Genereted app icon and added it

- Legal preparation

  - Draft privacy policy

  - Draft terms of service

  - Specify subscription cancellation policy

  - Review for GDPR complience

- Tests

  - Handling Offline State

  - Handling Network Error

  - Change subscription

  - UI responsiveness.

  - All of functions

  - Various screeen size tests using iOS Simulator

  - Accessivibility - microphone

  - Background/foreground change

  - Slow network