default import send web requests to Microsoft API

[imaginetonic]

Is there any reason why any importation trigger a web requests to Microsoft API?
A simple:
import deep_translator will trigger requests.get(microsoft_languages_api_url) located in constants.py
(commit: 8d368b7)

I would suggest to make this web request when MicrosoftTranslator is imported instead by moving the code in the MicrosoftTranslator class init.

Awesome job otherwise with the project.