Add French translation for OptiGUI 3

[JustArthur]

No description provided.

[opekope2]

Hello!
Thank you for your patience — I was working on updating the translations, which took more time than I expected. I updated the translations on the dev branch with over 70 new translations.
If you want to submit updated translations for the next OptiGUI 3 alpha release, you have at least 30 days.

[opekope2]

After implementing more features, I had to make some minor changes to the translations.

After skimming through the translation file, I have some suggestions:

• optigui.rp_converter.convert_properties: OptiFine uses the .properties extension, but it can stay like how it is, I don't speak French
• For optigui.rp_loader.warn.no_interaction_target, I didn't provide enough context. blocks, entities, items, inventory, and unknown will be part of V2 JSON resources (just like texture.PATH in OptiFine properties):

  {
    "blocks": [],
    "entities": [],
    "items": [],
    "inventory": false,
    "unknown": true
  }

[JustArthur]

Thanks for the clarification!
I’ve updated the French translation accordingly:

optigui.rp_converter.convert_properties → changed to

“Convertir les fichiers ".properties" d'OptiFine”
to better reflect the fact that OptiFine specifically uses the .properties file extension.

optigui.rp_loader.warn.no_interaction_target → reworded to match the context you mentioned for the upcoming V2 JSON resources.
It now reads as:

“Aucune cible d’interaction (blocs, entités, objets, inventaire ou inconnu) n’a été configurée dans la ressource JSON”
which better aligns with the new blocks, entities, items, inventory, and unknown fields planned for V2.

I’ve also translated the new strings and made minor adjustments to some existing lines to keep the French localization consistent and accurate.

[opekope2]

The translation keys for OptiGUI 3 alpha 4 are finished, no more additions, maybe small clarifications.
I organized the translation keys since your last revision, so some of them may be out of place. Other than that, 1 translation is missing.
You have at least 30 days to update your translation.

[opekope2]

I reviewed your translation, and have a couple of suggestions:

• I changed INI translations to .ini, similar to .properties
• optigui.validation.error.not_a_relative_identifier: relative resource location refers to an OptiGUI-specific variant of https://minecraft.wiki/w/Resource_location, so ./texture.png can be used instead of namespace:path/to/texture.png
• optigui.validation.error.empty_map: map refers to this data structure, not a map item