Update french translations

[corentinbettiol]

Description

Updated french translations, because some new terms were missing, and some older translations were not using the right wording (+ add missing periods & other minor fixes).

References

Fix #751 .

Checklist

• [x] I have read the contribution guide
• [x] changes file included (see docs)

[coveralls]

coverage: 97.167%. remained the same when pulling b0c930bfce720f9301e3be8427959c1dbeca5166 on kapt-labs:feature/751-french-translation into dc80a6d86e47876a606f68161fc3744bb8ce2afa on nephila:develop.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (dc80a6d) 94.38% compared to head (b0c930b) 94.38%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #752 +/- ## ======================================== Coverage 94.38% 94.38% ======================================== Files 26 26 Lines 1871 1871 Branches 266 266 ======================================== Hits 1766 1766 Misses 53 53 Partials 52 52 ``` | [Flag](https://app.codecov.io/gh/nephila/djangocms-blog/pull/752/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nephila/djangocms-blog/pull/752/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | `94.38% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#carryforward-flags-in-the-pull-request-comment) to find out more.

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[corentinbettiol]

translations were added from transifex