Validate the translation services

[maeriil]

In the imagetranslation.py, we can pass which translation API we want to use. Currently our program should support 2 APIs for production level and 1 APIs for development

Production level APIs are

• Google Translation API
• Amazon Translate API

Development level APIs are

• Python Unofficial Google Translate

In the translate function, we can pass in translation service in a string as follows
translate(image, translation_service=""

The default is always the python-googletrans as it doesn't need credentials.

When the translation service is not python google translate, we need to look for proper API credentials in order for it to work properly.

Therefore we need to do the following:

• Validate if the passed translation service is supported
• If the passed translation service is one of Production level APIs, we need to look for proper credentials in some sort of .config file
• Fallback should be python google translate if credentials was not found, or if passed translation service is not supported. However, it should warn the user that the fallback was used and why it happened.