Task/french content

[katedee]

This PR handles all the translations that were put up as issues, as well as a couple missed keys :)

• Resolves #504
• Resolves #505
• Resolves #506
• Resolves #507
• Resolves #508
• Resolves #509
• Resolves #510
• Resolves #511
• Resolves #512 (there were no changes here, since removing the line was done earlier)
• Resolves #513
• Resolves #514
• Resolves #515
• Resolves #516
• Resolves #517
• Resolves #518
• Resolves #519
• Resolves #520
• Resolves #521
• Resolves #522
• Resolves #523
• Resolves #524
• Resolves #525

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

0.0% Coverage
0.0% Duplication