Brave fees need notes for user wallet transactions

[mandar-brave]

When a user wallet -> Creator wallet transaction happens, at the moment the transaction is split --
95% goes directly to the creator
5% goes to Brave Software

We should add a note to the 5% transaction calling it as a "5% transaction fee"

cc @davidtemkin for text
@NejcZdovc @lukemulks @evq

[mandar-brave]

Uphold can't yet make fix available to us.
Note: 5% transaction fee collected by Brave Software International

@NejcZdovc ready to ship!

[NejcZdovc]

expected:

[LaurenWags]

Verified passed with

Brave	1.1.21 Chromium: 79.0.3945.79 (Official Build) (64-bit)
Revision	29f75ce3f42b007bd80361b0dfcfee3a13ff90b8-refs/branch-heads/3945@{#916}
OS	macOS Version 10.13.6 (Build 17G5019)

• Verified test plan from Adds message to fee transaction brave-core#4201
• Verified no message displays on the tip email
• Verified message about 5% transaction fee displays in the email and on sandbox.uphold.com:

Verification PASSED on macOS 10.15.1 x64 using the following build:

Brave	1.1.21 Chromium: 79.0.3945.79 (Official Build) (64-bit)
Revision	29f75ce3f42b007bd80361b0dfcfee3a13ff90b8-refs/branch-heads/3945@{#916}
OS	macOS Version 10.15.1 (Build 19B88)

Note: Went through these cases using Production

• Verified test plan from Adds message to fee transaction brave-core#4201
• Verified no message displays on the tip email
• Verified message about 5% transaction fee displays in the email and on uphold.com

Verification passed on

Brave	1.1.21 Chromium: 79.0.3945.79 (Official Build) (64-bit)
Revision	29f75ce3f42b007bd80361b0dfcfee3a13ff90b8-refs/branch-heads/3945@{#916}
OS	Ubuntu 18.04 LTS

• Verified test plan from Adds message to fee transaction brave-core#4201

Verification passed on

Brave	1.1.21 Chromium: 79.0.3945.79 (Official Build) (64-bit)
Revision	29f75ce3f42b007bd80361b0dfcfee3a13ff90b8-refs/branch-heads/3945@{#916}
OS	Windows 7 Service Pack 1 (Build 7601.24530)

• Verified test plan from Adds message to fee transaction brave-core#4201