User: Add TOTP 2FA authentication - refs #4431

[codeclimate[bot]]

Code Climate has analyzed commit ae664de2 and detected 59 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Style	53
Complexity	1
Clarity	2
Bug Risk	3

View more on Code Climate.

[ywarnier]

Lang vars:

• 'Enter TOTP code' (v)
• 'Submit TOTP' (v)
• '2FA disabled successfully.'
• 'Enable Two-Factor Authentication (2FA)'
• 'Update Settings'
• 'Scan the QR Code to enable 2FA'