Adds module-level _resolve_log_content(session, log_id, lang) helper
to app/routers/pages.py: looks up StrategicLogTranslation by (log_id,
lang) when lang != 'en'; falls back silently to the English original
when no translation row exists yet (the expected case for the first
hour after a new language activates, or when translation fails for a
specific log).
log_page / log_page_day pull cu.user.lang and thread it through
_log_page_context so the template renders the right variant.
Two tests cover both branches.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
