feat: Add Romanian (RO) translation

[NicolaeFericitu]

Added translation.json for Romanian language.

Description

This PR adds the Romanian translation for the Zen Browser website.

Technical Note for Reviewers (Critical)

Regarding routes.index.hero.title:
To ensure a natural word order in Romanian ("un internet mai liniștit"), I moved the "highlight": true property from the 5th element (index 4) to the 6th element (index 5).

Please verify that the Hero component rendering logic relies on the item.highlight property and not on a hardcoded index, so the visual highlight is applied to the correct adjective.

JSON file has been validated.

[NicolaeFericitu]

I have submitted a comprehensive and professional Romanian translation for the website. I have rigorously analyzed the file to ensure it meets high-quality standards, adhering strictly to established Romanian IT terminology.

I believe this version is polished and currently requires no further intervention or edits from other contributors. It is ready for merge as is.

However, I remain available if the core team notices any technical context issues.

I chose the spelling 'Mod-uri' (with a hyphen) instead of 'Moduri' specifically to avoid semantic ambiguity with the Romanian word for 'Modes' (e.g., Dark Mode, Reading Mode). The hyphen visualizes the distinction for 'Mods' (modifications/extensions).

[NicolaeFericitu]

Hi @zen-browser/maintainers, just a friendly ping regarding this Romanian translation. I've addressed the terminology nuances in my previous comments. Could you please approve the workflow and provide a review when you have a moment? Thank you!