Missing translations for onboarding modal on first launch

[srirambv]

Description

Missing translations for onboarding modal on first launch

Steps to Reproduce

1. Set locale to France (FR)
2. Install 1.21.65 x64 beta build
3. Launch browser, trigger onboarding modal that is not translated

Actual result:

Expected result:

Translated strings when locale is not EN

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	1.21.62 Chromium: 88.0.4324.182 (Official Build) beta (64-bit)
Revision	73ee5087001dcef33047c4ed650471b225dd8caf-refs/branch-heads/4324@{#2202}
OS	Linux

Version/Channel Information:

• Can you reproduce this issue with the current release? NA
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? NA
• Does the issue resolve itself when disabling Brave Rewards? NA
• Is the issue reproducible on the latest version of Chrome? NA

Miscellaneous Information:

cc: @rebron @mkarolin

[btlechowski]

Dupe of #14163

[srirambv]

Thanks for linking @btlechowski . Closing as dupe of #14163