Reporter @Rekoo-PS hit three independent gaps trying to deliver an
Arabic Meta template. Bundled here because they fan out from the same
root cause (no first-class language config on the WhatsApp tab) and the
review surfaces are tightly coupled.
**1. Test send hardcoded `en_US` (`adminWhatsapp.js:141`).** Smoking gun
for "I can't make it work" — Meta returned template_not_found_in_language
(132001) on every test send for non-English templates, no matter what
else the admin configured. Replaced with `config.template_language ||
'en_US'`.
**2. No `template_language` field on `whatsapp_configs`.** The only
priors were per-message `data.language` (always null from our callers in
`adminEvents.js:854,1188`) and `app_settings.general_default_language`
(the *system UI* language, not the *template's* language registered with
Meta). Migration 137 adds the column; GET + PUT surface it; the
processor uses it as the highest-priority default when message_data
doesn't override.
Resolution order in `whatsappProcessor.processWhatsAppQueue` is now:
1. message_data.language (per-event override — caller path TBD)
2. config.template_language (admin-pinned template language)
3. app_settings.general_default_language (system fallback)
4. en_US (hardcoded last resort)
**3. `LANGUAGE_MAP` + `PASSWORD_LABELS` didn't cover Arabic.** Added
`ar` (Meta's single-code form per RFC; no region variant). For any
language we don't enumerate (e.g. Turkish `tr_TR`, Chinese `zh_CN`,
Hebrew `he_IL`), `resolveLanguageCode` now pass-throughs valid-shape
codes (lowercase-language + optional underscore + uppercase-region) and
forwards them to Meta as-is. If they don't match a registered template
Meta returns 132001, which the test route already surfaces back to the
admin via `error.message` — fail-loud, no silent fallback.
Validation:
- Unit smoke on `resolveLanguageCode` across 18 representative inputs
(in-map, pass-through, canonicalization, rejection) — all behaviours
correct.
- Lint clean on all 7 changed files.
- Frontend `tsc --noEmit` clean.
- Migration `node -c` syntax-checked; additive + `hasColumn`-guarded so
re-running is safe.
Frontend: free-text input on the WhatsApp tab with EN + DE i18n.
Pointing at Meta's supported-languages docs via the hint text — Meta's
list grows; a hardcoded dropdown would rot.
Closes#647.
Paul Nothaft
4fd7709596