Multilingual: List multilingual content

[lickem22]

Reviewer: @sidravi1

Estimate: 1h30

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Ticket

AAQ-427:

Description, Motivation and Context

Goal

The goal of this PR is to update the frontend and the backend to be able to list multilingual contents.

Changes

The following changes have been made to the frontend:

• Added language list to the content card
• Added a dropdown list to "filter" contents by language. I put filter in quote because changing the language triggers a new call to the API rather than a frontend filtering.
• Updated the landing page to look like the wireframe.

The following changes have been made to the backend:

• Updated the database to support multilingual contents. I added in the languages migration file a query to create a first default language. Since adding a frontend for language management is out of scope for this feature, I did this temporary fix so the app don't crash.
• Updated the models and different db connections to support multilingual support
• Refactor the endpoints to support the new changes to the DB. I added all the CRUD endpoints to make testing easier since we cannot add a content using the frontend yet. These endpoints are subject to change and should be discarded for now ( appart from the endpoints relevant to this PR)
• We agreed to create a view of the landing to make querying faster but I suggest we leave that for another ticket to have time to design the view properly.

How has this been tested?

I added different languages first then added content in different languages. Tested how they are listed on the frontend. Also tried filtering for different languages and searching for contents.
I disabled tests that will not work due to DB changes. I will updated them in a latter PR.

Checklist

Fill with x for completed. Delete any lines that are not relevant

• My code follows the style guidelines of this project
• I have reviewed my own code to ensure good quality
• I have tested the functionality of my code to ensure it works as intended
• I have resolved merge conflicts
• I have updated the automated tests (if applicable)
• I have updated the requirements (if applicable)
• I have updated the README file (if applicable)
• I have updated affected documentation (if applicable)

[suzinyou]

All the APIs seem to work and tests ran.