Follow up to #8031 - Missing string on NTP SI widget

[btlechowski]

Follow up to #8031 - Turn on Brave Ads to claim your share. You can also choose to hide sponsored images is not translated into Polish

Steps to Reproduce

1. Clean install in Polish
2. Enable Rewards
3. Disable Ads
4. Enable NTP SI Demo flag
5. Open NTP SI

Actual result:

Missing string on NTP SI widget for Polish language

Expected result:

Turn on Brave Ads to claim your share. You can also choose to hide sponsored images is translated into Polish

Reproduces how often:

100% repro rate

Brave version (brave://version info)

Brave	1.3.113 Chromium: 80.0.3987.87 (Official Build) (64-bit)
Revision	449cb163497b70dbf98d389f54e38e85d4c59b43-refs/branch-heads/3987@{#801}
OS	Ubuntu 18.04 LTS

cc @brave/legacy_qa @mkarolin @rebron @bsclifton @NejcZdovc @petemill

[rebron]

@btlechowski Can you recheck in 1.8.x when you get a chance?

[btlechowski]

No longer reproducible

Verification passed on

Brave	1.10.74 Chromium: 81.0.4044.138 (Official Build) dev (64-bit)
Revision	8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS	Ubuntu 18.04 LTS

Verified test plan from the description

Verification passed on

Brave | 1.10.77 Chromium: 81.0.4044.138 (Official Build) dev (64-bit)
-- | --
Revision | 8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS | Windows 10 OS Version 1803 (Build 17134.1006)

• Verified test plan from the description
  

---

Verified passed with

Brave | 1.10.79 Chromium: 81.0.4044.138 (Official Build) dev (64-bit)
-- | --
Revision | 8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS | macOS Wersja 10.14.6 (kompilacja 18G3020)

• Verified STR from description