Add portuguese translation

[padilhath]

This Pull Request not only presents the translation into Portuguese but also includes the necessary adjustments to ensure its adequate functionality and add the appropriate credits. I looked at how other translations were added, so I believe I haven't overlooked anything and there are no mistakes.

Credits

• Maatsuki - Brazilian translator who had previously translated the mod.
• padilhath - Reviewed the translation, made changes to README.md, and updated AlternativeTextures.csproj.
• Vila dos Tradutores - An incredible Brazilian community of translators on Discord.

[Floogen]

Thank you for the thorough pull request! I will include this in the next release.