Translate to BETA 100%

[atuchin-m]

Relates brave/brave-browser#24471

[kjozwiak]

Used the same approach used via #309 (comment) to ensure that the above change is working as expected.

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

Brave | 1.43.65 Chromium: 104.0.5112.81 (Official Build) beta (64-bit)
-- | --
Revision | 5b7b76419d50f583022568b6764b630f6ddc9208-refs/branch-heads/5112@{#1309}
OS | Windows 11 Version 21H2 (Build 22000.832)

BETA channel

Clean Profile via BETA

• launched 1.43.65 Chromium: 104.0.5112.81 using the following:
  • brave.exe --enable-logging=stderr --variations-server-url=https://variations.bravesoftware.com/seed
• once launched, restarted the browser again and ensured that BraveTranslateStudy:Enabled via brave://version
• visited several websites using Polish, German & Spanish and ensured that the new UI appears via the URL bar
• ensured that translating pages contacts the https://translate.brave.com endpoint
• ensured that you can go back and forth between English and the language that's present on the page without issues
• ensured that Always translate [x] works as expected
  • also ensured that disabling Always Translate [x] after it was enabled works as expected

Polish website being translated

Example	Example	Example

Japanese website being translated

Example	Example	Example

As mentioned above, also ensured that we're using https://translate.brave.com when translating pages as per the following:

Page automatically being translated	Manually translating a page

Profile with the Google Translate extension already installed

Before running through these cases, ensured that Google Translate was installed before re-launching the browser and being added into the BraveTranslateStudy:Enabled study.

• ensured that our new Brave Translate UI doesn't appear via the URL bar when the Google Translate extension is installed
• ensured that our new Brave Translate UI appears via the URL bar once the Google Translate extension was removed
  • also ensured that translations worked as expected once Brave switched to https://translate.brave.com from the extension

Aktuelle.Nachrichten._.BILD.de.-.Brave.2022-08-10.22-29-50.mp4

RELEASE channel

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

Brave | 1.42.88 Chromium: 104.0.5112.81 (Official Build) (64-bit)
-- | --
Revision | 5b7b76419d50f583022568b6764b630f6ddc9208-refs/branch-heads/5112@{#1309}
OS | Windows 11 Version 21H2 (Build 22000.832)

• launched 1.42.88 Chromium: 104.0.5112.81 using the following:
  • brave.exe --enable-logging=stderr --variations-server-url=https://variations.bravesoftware.com/seed
• once launched, restarted the browser again and ensured that BraveTranslateStudy wasn't visible via brave://version
• visited several websites using Polish, German & Spanish and ensured that the prompt re: installing Google Translate appeared as expected
  • also ensured that installing/using the extension worked as expected on the RELEASE channel

BraveTranslateStudy not visible	Prompt re: Google translate extension	Extension installed