Chore(i18n): Global translations refresh, updated French translation and more

[theMimolet]

Hello !

I'm Mimolet, a French translator mostly known for translating Bazaar.
As I'm working with games for my studies, and wanted to preview 3D models.
I discovered your app, but the French translation wasn't up to date.
So I wanted to update that translation.

As you may guess, I did a bit more than that, here's a recap of my changes :

• Metainfo : I wanted to fix a typo with Benchy (it was written "Bechy"), but then my text editor realigned stuff around, so I cleaned it up a bit
• update_translations.sh : I added a script to update the translation files. It was originally written for the Cine video player (another project on which I did the French translation), but I changed a few things to make it work for Exhibit - if you have an issue with it, we can simply remove it
• All the translations : I refreshed all the .po files (most of them haven't been updated since 2024), making sure they got correct infos and reordered the LINGUAS because fr wasn't at the right place
• French translation : At last, I updated the French translation

I've also noticed the view presets aren't translatable - I know it's because of technical reasons, because they come from a JSON file, but at least now you know (it's not urgent)

I hope it isn't too much,

Have a nice day,
Mimolet