Update Brave translate icon on URL bar to replace Chromium default

[aguscruiz]

Description

Currently, Brave translate shows an icon in the URL bar to offer translations. Desktop browser has chromium's default, and Android has a custom one that doesn't scale too well to be used in Desktop. So we're going to provide a new one that works for both versions.

Related Android ticket: #23770

Steps to Reproduce

Desktop browser

1. On nightly, open https://www.heise.de/
2. See icon for translation

Actual result:

Expected result:

New icon will be provided when it's defined

Desktop Brave version:

Nightly

[aguscruiz]

@rebron Updated icon available here:
Light mode: https://www.figma.com/file/tLXWGCpNoiJxDZDdpfordj/Desktop-Settings?node-id=2625%3A70968
Dark mode: https://www.figma.com/file/tLXWGCpNoiJxDZDdpfordj/Desktop-Settings?node-id=2625%3A71522

[stephendonner]

Verification PASSED using

Brave	1.43.70 Chromium: 104.0.5112.81 (Official Build) beta (x86_64)
Revision	5b7b76419d50f583022568b6764b630f6ddc9208-refs/branch-heads/5112@{#1309}
OS	macOS Version 11.6.8 (Build 20G730)

Used the reference icons from #24150 (comment)

Steps:

1. installed 1.43.70
2. launched Brave
3. loaded https://www.spiegel.de/
4. confirmed new icon asset in both Light and Dark modes

Light	Dark

[Uni-verse]

Verified on Samsung GS 21 running Android 12 using

Brave	1.43.71 Chromium: 104.0.5112.81 (Official Build) beta (64-bit) 
Revision	5b7b76419d50f583022568b6764b630f6ddc9208-refs/branch-heads/5112@{#1309}
OS	Android 12; Build/SP1A.210812.016

Specs: https://docs.google.com/document/d/1LBmoyUveZaMcnycpRqg91lhzZFjDx_19zM3x6ulNpHg/edit?usp=sharing

Preconditions:

1. Enable Brave Translate-go flag
2. Enable Chromium translate flag
3. Relaunch browser

• Verified translation icon is updated to spec and is displayed in the translate bar
• Verified new translate asset in the menu in light and dark mode.
• Verified translate icon placement under find in page

Dark Mode	Light Mode

[Uni-verse]

Verified on Samsung Galaxy Tab S7 running Android 12 using

Brave	1.43.71 Chromium: 104.0.5112.81 (Official Build) beta (64-bit) 
Revision	5b7b76419d50f583022568b6764b630f6ddc9208-refs/branch-heads/5112@{#1309}
OS	Android 12; Build/SP1A.210812.016

Specs: https://docs.google.com/document/d/1LBmoyUveZaMcnycpRqg91lhzZFjDx_19zM3x6ulNpHg/edit?usp=sharing

Preconditions:

1. Enable Brave Translate-go flag
2. Enable Chromium translate flag
3. Relaunch browser

• Verified translation icon is updated to spec and is displayed in the translate bar
• Verified new translate asset in the menu in light and dark mode.
• Verified translate icon placement under find in page

Dark Mode	Light Mode