Adding "Never Ask Again" under Google Translate popup

Description

When we released the Google Translate popup feature in 0.69.x via https://github.com/brave/brave-browser/issues/5561, it made using Brave more inconvenient for none-english peaking users as they constantly get the popup when visiting English websites. Some examples of user concerns: https://github.com/brave/brave-browser/issues/6326, https://github.com/brave/brave-browser/issues/6329, https://github.com/brave/brave-browser/issues/208#issuecomment-538279280, https://github.com/brave/brave-browser/issues/208#issuecomment-538537499.

We should add a Never ask again or a Don't ask again checkbox under the prompt that would control the Offer to translate pages that aren't in a language you read setting via brave://settings/languages.

Steps to Reproduce

1. install and launch 0.69.132 Chromium: 77.0.3865.90
2. depending on your locale, visit a website that’s in a different language so you get the Google Translate prompt.

Actual result:

Expected result:

Should be similar to what we implemented with Widevine. Example:

Reproduces how often:

100% reproducible using the above STR.

Brave version (brave://version info)

Brave	0.69.132 Chromium: 77.0.3865.90 (Official Build) (64-bit)
Revision	58c425ba843df2918d9d4b409331972646c393dd-refs/branch-heads/3865@{#830}
OS	macOS Version 10.14.6 (Build 18G95)

Version/Channel Information:

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

Other Additional Information:

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

Miscellaneous Information:

CCing @rebron @bsclifton @bbondy @davidtemkin @yrliou @brave/legacy_qa

[karenkliu]

How about this:

[rebron]

@bradleyrichter @karenkliu Do we even need a mock? I think we can simply go with the: [ ] Don’t ask again check box like what @kjozwiak linked to above.