docs(i18n): defer README template-driven generation, capture #195 discussion

[laihenyi]

Follow-up to #196 / discussion in #195. After PR #196 landed, @andriishin pointed out NRG (single .src.md template → multi-locale README.<lang>.md) as a fix for the atomic-update brittleness called out in TRANSLATIONS.md step 7. @lefarcen analyzed the fit and we agreed the right move is document-and-defer rather than fold tooling into the docs RFC.

This PR captures that decision in TRANSLATIONS.md so future contributors don't relitigate it from scratch.

What changes

A single bullet under Deferred decisions — parallel in shape to the existing Translation memory tooling entry:

• Lists multiple options (NRG, custom .src.md scripts, All Contributors-style) so we don't lock into one tool prematurely.
• Trigger conditions: ≥15 locales OR README structural edits more frequent than monthly.
• Records the core trade-off from the RFC: TRANSLATIONS.md — i18n contribution guide and starter glossary #195 thread: template-driven generation solves the "update line 27 in 10 README variants" brittleness but forces a shared structure that today's locale variants intentionally diverge from (e.g. README.zh-TW.md's "上手體驗" section, the pt-BR / pt-PT content-level precedent).

Why "Deferred" not "Open question"

The existing Open questions section is for genuinely undecided items. NRG-class tooling has been actively discussed in #195 and the team agreed to defer with explicit triggers — that's the same shape as the TM-tooling entry already living under Deferred decisions.

Out of scope

A separate tracking issue ("Evaluate template-driven README generation") will collect NRG + alternatives and link back here. That's a separate, smaller change that doesn't need to ride with this docs update.

Test plan

• Render TRANSLATIONS.md on GitHub; confirm the new bullet renders alongside the TM-tooling bullet under Deferred decisions.
• Confirm the RFC: TRANSLATIONS.md — i18n contribution guide and starter glossary #195 link resolves to the NRG discussion thread.

[lefarcen]

Hi @laihenyi! 🎉
Thanks for the contribution — excellent follow-up capturing the NRG discussion from #195.
I will run a deep review and get back to you within 24h.

Thanks for making open-design better!
— open-design team

[mrcfps]

@laihenyi I reviewed the TRANSLATIONS.md deferred-decision update and verified the new README template-generation guidance is scoped to the changed documentation, keeps the existing deferred-decisions structure, and records clear revisit triggers plus the locale-variation trade-off. This is a tidy follow-up that should make future i18n tooling discussions easier to pick up without forcing premature process changes. Thanks for capturing the rationale so clearly. 🙌

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