Internationalization (WIP)

[DzhideX]

This issue aims to track the overall progress of the internationalization implementation for joystream-org. The implementation choices and other important details were handled here: #257

Since this is also the first time I am doing something like this, it is hard for me to gauge how much work there is and any specifics that may arise that need extra work so I will be keeping this issue as a WIP and add more tasks (or subtasks) if necessary down the road.

The general overview of the tasks should look like this:

• Implement the react-i18next library with only the english language. This will be used as a foundation for all future languages that need to be implemented in the future.
• Let Joystream community members contribute translations to the project.
• Implement all the new lanugages while making sure that the alignment and style of the components stay intact.