Update default tipping banner text

[NejcZdovc]

Current text:

You can support this site by sending a tip. It’s a way of thanking them for making great content. Verified content creators get paid for their tips during the first week of each calendar month.

If you like, you can schedule monthly tips to support this site on a continuous basis.

New text:

You can support this content creator by sending a tip. It’s a way of thanking them for making great content. Verified creators get paid for their tips during the first week of each calendar month.

If you like, you can schedule monthly tips to support this creator on a continuous basis.

[LaurenWags]

Verified passed with

Brave	0.67.106 Chromium: 75.0.3770.100 (Official Build) beta(64-bit)
Revision	cd0b15c8b6a4e70c44e27f35c37a4029bad3e3b0-refs/branch-heads/3770@{#1033}
OS	Mac OS X

• Verified test plan from Updates default text for tip banner brave-core#2506 (using staging environment)
  

Verification passed on

Brave	0.67.106 Chromium: 75.0.3770.100 (Official Build) beta (64-bit)
Revision	cd0b15c8b6a4e70c44e27f35c37a4029bad3e3b0-refs/branch-heads/3770@{#1033}
OS	Windows 10 OS Version 1803 (Build 17134.523)

• Verified test plan from Updates default text for tip banner brave-core#2506
  

Verification passed on

Brave	0.67.110 Chromium: 75.0.3770.100 (Official Build) beta (64-bit)
Revision	cd0b15c8b6a4e70c44e27f35c37a4029bad3e3b0-refs/branch-heads/3770@{#1033}
OS	Linux

• Verified test plan from Updates default text for tip banner brave-core#2506