Update French localizations

[Signez]

A few more strings that were introduced / changed just after my last pass on translations (it happens! 🤷‍♂️), mainly about the Chat feature.

Pinging @surfdude29 and @pfrazee as usual, but nothing should raise any eyebrows anyway :)

[surfdude29]

Sorry for the delay, excellent work as always @Signez 👌

I just have two points I wanted to mention.

[surfdude29]

Also, I have one change to suggest that's not in this PR; I think the second string below can be simplified to match the first string:

social-app/src/locale/locales/fr/messages.po

Lines 2035 to 2045 in 8b5547b

	#: src/view/screens/Settings/index.tsx:566
	msgid "Following feed preferences"
	msgstr "Préférences du fil d’actu « Following »"
	#: src/Navigation.tsx:269
	#: src/view/com/home/HomeHeaderLayout.web.tsx:64
	#: src/view/com/home/HomeHeaderLayoutMobile.tsx:87
	#: src/view/screens/PreferencesFollowingFeed.tsx:103
	#: src/view/screens/Settings/index.tsx:575
	msgid "Following Feed Preferences"
	msgstr "Préférences en matière de fil d’actu « Following »"

[surfdude29]

And the suggested change from a user in #4296 is here:

social-app/src/locale/locales/fr/messages.po

Lines 1391 to 1393 in 8b5547b

	#: src/view/com/composer/Composer.tsx:579
	msgid "Discard"
	msgstr "Ignorer"

[Signez]

@surfdude29 Thanks again for your review!

All the suggested changes were applied in this commit, including the fix for #4296 and that weird long string for Following Feed Settings (that bothered me too, but I forgot to fix it somehow before); I also took the time to bump the locales again and translate three new, very basic strings to keep this PR up-to-date.

@pfrazee Now that this was reviewed by a peer, I think you can merge this with confidence :)

[pfrazee]

Thanks!!