I18n: Edit languages

[carlito-scality]

Component: UI

Why this is needed:

• Users should be able to change the language from the UI
  What should be done:
• Design and implement a User Preference modal/page to allow user to edit the language of the UI.
• The language has to default to the browser language and be stored in the cookie/session.
• Add cypress test to cover this case

Implementation proposal (strongly recommended):

As a first implementation, we only need to be able to switch between french and english. So a "switch" button on the user dropdown is enough.

Test plan: