Disable reduce language feature by default

[pilgrim-brave]

Resolves brave/brave-browser#23610

Submitter Checklist:

• I confirm that no security/privacy review is needed, or that I have requested one
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Squashed any review feedback or "fixup" commits before merge, so that history is a record of what happened in the repo, not your PR
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally: npm run test -- brave_browser_tests, npm run test -- brave_unit_tests, npm run lint, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

[bbondy]

Pls fill out the checklist. Thx!

[kjozwiak]

Verification PASSED on Win 11 x64 using the following build(s):

Brave | 1.42.22 Chromium: 103.0.5060.53 (Official Build) nightly (64-bit)
-- | --
Revision | a1711811edd74ff1cf2150f36ffa3b0dae40b17f-refs/branch-heads/5060@{#853}
OS | Windows 11 Version 21H2 (Build 22000.739)

Quick note for @brave/qa-team: We currently have the FP Language/Font feature disabled via Griffin as per brave/brave-variations#292. So with the following verification, please make sure the browser isn't restarted so it doesn't start using the various variation studies. You could also launch Brave with something similar to the following so it never contacts Griffin:

brave.exe --enable-logging=stderr --variations-server-url=https://variations.bravesoftware.com/FakeSeed

This is going to be challenging to QA but I basically just made sure the following websites are loading as expected as these were the ones reported broken by various people via brave/brave-browser#23093.

https://www.ghacks.net

Mentioned via brave/brave-browser#23093 (comment).

Broken	Fixed

https://valhost.net/demo

Mentioned via brave/brave-browser#23093 (comment).

Broken	Fixed