Adaptive captcha missing translation when resolving captcha

[btlechowski]

Follow up to #15600

Steps to Reproduce

1. Clean profile
2. Run Brave in Polish PL locale
3. Enable Rewards and Ads
4. Schedule a captcha for your payment ID
5. Trigger unblinded tokens refill
6. Click Rozwiąż

Actual result:

Missing translations

Expected result:

No missing translations

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	1.31.85 Chromium: 95.0.4638.50 (Official Build) (64-bit)
Revision	3e9db37693d0cf8e31a89fbcf50401ae91125cef-refs/branch-heads/4638@{#816}
OS	Ubuntu 18.04 LTS

cc @emerick @tmancey @jsecretan @brave/legacy_qa @rebron @mkarolin

[emerick]

@gpestana I think this would be implemented server-side, right?

[gpestana]

Correct, the locale logic is implemented on the server side since the iframe payload generated on the server. We don't have the locale logic implemented yet, although it is top priority work once we roll out adaptive captchas to production.

Related to https://github.com/brave-intl/bat-reputation/issues/52