English/French translations + edit drawer error handling

[willyyhuang]

Closes #385 , #423

Added react-i18next to handle english/french translations
Edit drawer should not close on failure as well now.

Usage of react-i18next is

• import useTranslation hook (since we are using functional components, hooks work the best)
• use the t function to find the specific string in the translation files

[codeclimate]

Code Climate has analyzed commit bef89a0 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 89.9% (90% is the threshold).

This pull request will bring the total coverage in the repository to 91.6% (0.3% change).

View more on Code Climate.

[willyyhuang]

Diff-coverage is 89.9% and total coverage increased by 0.3%, the reason why diff-coverage can not be achieved to 90% is because there are conditions where we can't test in unit tests now, such as autocomplete fields and useEffect hooks.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
3 Code Smells

0.0% Coverage
2.1% Duplication

[luigibesani]

Excellent work! You really were thorough with the translations; it seems that everything is covered.
The implementation of the translation framework is very clean as well.
We should discuss about the presence of the language selection drop down in the front page.