Fix the wording on the BR widget

[jenn-rhim]

Description

Incorrect wordings on the widget in nightly.

Steps to Reproduce

Actual result:

Expected result:

1. Change 'Get paid' to 'Earn rewards'
2. Change "Brave Ads" to "Brave Private Ads"
3. Change 'By clicking rewardsWidgetEarnAndGive, you agree to...' to 'By proceeding, you agree to...'

Reproduces how often:

Brave version (brave://version info)

Version/Channel Information:

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

Other Additional Information:

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

Miscellaneous Information:

[rebron]

@zenparsing when you get a chance can you take a look?

[rebron]

related to: #8361

[zenparsing]

@jenn-rhim What should the full text of the title be?

Perhaps this?

Earn rewards for viewing this sponsored background image.

[zenparsing]

@jenn-rhim I was able to put together the following quick fix:

The wording of the terms of service links match the wording elsewhere in the widget. If we want to change it to "By proceeding, ..." the fix will take a bit longer.

Let me know if this works.

[zenparsing]

TOS text will be normalized in a followup: #13936.

[stephendonner]

Verified FIXED using

Brave	1.21.47 Chromium: 88.0.4324.152 (Official Build) beta (x86_64)
Revision	6579930fc53b4dc589c042bec9d0a3778326974d-refs/branch-heads/4324@{#2106}
OS	macOS Version 11.2 (Build 20D64)

Checked that @jenn-rhim's suggestions are in, with the exception of the Terms of Service text, which will be addressed in #13936:

1. "Get paid to view..." -> "Earn rewards for viewing..."
2. "Turn on Brave Ads" -> "Turn on Brave Private Ads"

---

Verification passed on

Brave	1.21.52 Chromium: 88.0.4324.152 (Official Build) dev (64-bit)
Revision	6579930fc53b4dc589c042bec9d0a3778326974d-refs/branch-heads/4324@{#2106}
OS	Ubuntu 18.04 LTS

1. "Get paid to view..." -> "Earn rewards for viewing..."
2. "Turn on Brave Ads" -> "Turn on Brave Private Ads"

---

Verified passed with

Brave	1.21.55 Chromium: 88.0.4324.152 (Official Build) beta (64-bit)
Revision	6579930fc53b4dc589c042bec9d0a3778326974d-refs/branch-heads/4324@{#2106}
OS	Windows 10 OS Version 1909 (Build 18363.1256)

Verified widget text matches #13397 (comment)