Create a translation dictionary guideline file for consistent localization

I noticed while doing some of the translations that we could benefit from having a standardized dictionary for terms that should or should not be translated across different languages.

I propose we create a new file to help maintainers and contributors with consistent translations.

Motivation

• Some technical terms and names should remain in English (e.g. RetroAchievements, RA, DevJam, hardcore, leaderboard, ...)
• Certain terms require specific translations to maintain consistency (e.g. Achievement -> "Conquista" in Portuguese)
• This will help avoid confusion and maintain quality across translations

Proposed Solution

Create a new file translation-dictionary.md in the docs root with the following structure:

# Translation Dictionary Guidelines

## Portuguese (pt-BR)

### Do Not Translate
- RetroAchievements
- DevJam 
- DevQuest
- RANews
- Softcore
- Hardcore
- RAM
- ROM
- API
- ID

### Standard Translations
| English | Portuguese |
|---------|------------|
| Achievement | Conquista |
| Leaderboard | Tabela de Classificação |
| Badge | Emblema |
| Set | Conjunto |
| Points | Pontos |
| Developer | Desenvolvedor |
| Game | Jogo |
| System | Console |

Implementation Steps

1. Create the initial dictionary file with Portuguese terms
2. Review current translations to align with the new guidelines

Future Considerations

• Expand to include spanish (ES) translations
• Create automated checks for consistent term usage

@wescopeland Can I start working on it?

Start in the docs root and create the proposed translation-dictionary.md using the Portuguese terms and structure described in the issue. Review the current translations for those terms, align them with the dictionary where appropriate, and confirm that the file documents do-not-translate names and standard translations clearly.