App crashes on launch when using a language that Brave supports but Chromium/brave-core doesn't

[kylehickinson]

Description:

Brave has its own set of localized languages that are independent from Chromium's list. When the app launches it loads the Chromium resource packs for the selected language the user is using, however there are languages that are supported by Brave but not Chromium such as pt_BR (Chromium only has pt and pt_PT). This fails to find load the resource pak since that language isn't localized and results in a failed CHECK

Steps to Reproduce

1. Set language to Portuguese (Brazil) (should also crash with certain Korea/China language/region combos)
2. Launch the app

Actual result:

Crashes

Expected result:

Fall back to Chromium supported languages and don't crash

Reproduces how often:

Always

Brave Version:

I believe we saw this crash log in 1.58, but tested and confirmed in 1.59+

[iccub]

Should be fixed as a part of latest core bump, please test using the STR

[Uni-verse]

Verified on iPhone X running iOS 16.7 using version 1.58 (23.10.17.18)

• Verified STR in App crashes on launch when using a language that Brave supports but Chromium/brave-core doesn't #8213 (comment) and confirmed Brave app does not crash using pt_BR locale.
• Verified user is able to re-launch Brave with crashing.
• Verified launching Brave without issues on fresh install as well as existing profile in pt_Br locale.

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