fix: Refine and unify pt-BR translations

[TheRodrig0]

This commit overhauls the Portuguese (pt-BR) translation file to improve consistency, accuracy, and natural phrasing across the application.

Key changes include:

• Standardization of Terms:

  • Consistently uses "Wallpaper" instead of "papel de parede", "fundo", etc., to maintain uniform terminology.

  • Standardizes on "Oficina Steam" for "Steam Workshop".

  • Unifies capitalization for recurring terms like "Vídeo", "Widget", and "Wallpaper".

• Improved Accuracy and Phrasing:

  • "Open containing folder" is now translated to the more natural "Abrir local do arquivo".

  • "Patchnotes" is more accurately translated to "Notas de atualização".

  • Verbs in UI elements like "Contain" and "Cover" are now correctly in the infinitive ("Conter", "Cobrir").

  • Phrasing for types like "Video Wallpaper" and "Website Wallpaper" now correctly uses the "de [tipo]" structure ("Wallpaper de Vídeo", "Wallpaper de site").

• Error Message Correction:

  • The ScreenPlay::Wizards error messages have been corrected and unified, standardizing on the verb "gravar" (to save/write file) and fixing a mistranslated error ("Could not copy...").

• General Style and Polish:

  • Corrected widespread capitalization inconsistencies in titles and labels (e.g., "Linha do tempo", "documentação", "motor 3D") for a more professional presentation.

Contributor Agreement

• I'm a individual contributor, have read the individual contributor license agreement and accept the conditions.

or

• I'm a corporate contributor, have read the corporate contributor license agreement and accept the conditions.

[kelteseth]

Thanks! I have updated the PR description, because it looks like we only have a PR template for GitLab. If you check the box for Contributor Agreement we can merge this. Thank you :)