Translations v1

[Angamanga]

This PR adds the translations-feature to posts.
To test:
Add a new translation:

• As a logged in user with edit-rights...
• Go to data-view and click on a post
• Click on the translate-icon (the icon is currently only available in the detailed-view. We can discuss if it should be in feed-view/map-view as well when planning for V2)
• Translations-modal opens
• There is a list of languages to choose between
  - [ ] The original-language for a post is displayed first in the list and is disabled (Waiting for backend-fix for this so not working yet)
• Click on a language
• An edit-view opens
• Add translations and save
• The window closes and the post is displayed in the translated language
• Click on Change language and add a new translation from the modal
• The new language is displayed
• Click on "View original"
• The original is displayed
  View a translation
• As a logged out user, click on a published post that has translations
• Select a language in the dropdown
• The window closes and the post is displayed in the translated language

Above should also work on small screens
I haven't covered all cases of closing and opening the modal but test around and see how it behaves...

[linear]

USH-1595 Add translations v1

[ushahidlee]

Code looks fine and the functionality is 🔥

[Angamanga]

Note: Waiting with merging until it is possible to save base_language.