[Desktop] Add padding to Customize text to accomodate translations

[rebron]

Description

Customize text on the NTP needs to expand to support translations.

Steps to Reproduce

1. Go to NTP in Japanese version of Brave.
2. Notice that the Customize translation overflows into a second line.
3. Expected is that Customize translations fit into one line.

Actual result:

Expected result:

One line. [tbd] for screenshot.

Reproduces how often:

easy.

Brave version (brave://version info)

Version/Channel Information:

Brave	1.12.98 Chromium: 84.0.4147.89 (Official Build) beta (64-bit)
Revision	19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{#852}
OS	macOS Version 10.16 (Build 20A5323l)

• 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 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:

[rebron]

cc: @karenkliu @ryanml @anthonypkeane

[karenkliu]

We should set the bounding box of "Customize" to fit the width of the text so it doesn't wrap in different languages.

[btlechowski]

Verification passed on

Brave	1.17.28 Chromium: 86.0.4240.75 (Official Build) nightly (64-bit)
Revision	c69c33933bfc72a159aceb4aeca939eb0087416c-refs/branch-heads/4240@{#1149}
OS	Ubuntu 18.04 LTS

Verified that Customize text accommodates long translations
Japanese:

Polish:

---

Verification passed on

Brave | 1.17.39 Chromium: 86.0.4240.99 (Official Build) nightly (64-bit)
-- | --
Revision | 002668237e13d38aabd6d11c2d216dd22b736ff2-refs/branch-heads/4240@{#1229}
OS | Windows 10 OS Version 1903 (Build 18362.1082)

• Verified the description from the issue
• Logged a follow-up issue Follow up of #10946 - Incorrect Japanese translation for "Customize" under NTP #12194 for Japanese translation
• Verified Customize translation in Kannada and Hindi locales (working as expected)

Hindi locale

Kannada locale

---

Verification PASSED on macOS 10.15.7 x64 using the following build:

Brave | 1.17.41 Chromium: 86.0.4240.99 (Official Build) nightly (x86_64)
-- | --
Revision | 002668237e13d38aabd6d11c2d216dd22b736ff2-refs/branch-heads/4240@{#1229}
OS | macOS Version 10.15.7 (Build 19H2)

Finland	Russia	Congo

Reproduced & Commented on #12194 (comment).