Notification button on Brave Rewards Panel says MISSING:OK

[LaurenWags]

Description

Button on notification on Brave Rewards Panel says 'MISSING:OK'.

Steps to Reproduce

1. Enable Rewards on 0.55.16.
2. Click on BAT logo.
3. Notification is displayed.

Actual result:

Button text:

Expected result:

Button should not indicate missing text.

Reproduces how often:

easily

Brave version (brave://version info)

Brave	0.55.16 Chromium: 70.0.3538.54 (Official Build) (64-bit)
Revision	4f8e578b6680574714e9ed3bb9f02922b4dde40d-refs/branch-heads/3538@{#937}
OS	Mac OS X

Reproducible on current release:

• Does it reproduce on brave-browser dev/beta builds? n/a - code not in those builds yet
• Does it reproduce on browser-laptop? n/a

Website problems only:

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

Additional Information

cc @NejcZdovc @jenn-rhim

[LaurenWags]

Verified passed with

Brave	0.57.1 Chromium: 70.0.3538.67 (Official Build) dev (64-bit)
Revision	9ab0cfab84ded083718d3a4ff830726efd38869f-refs/branch-heads/3538@{#1002}
OS	Mac OS X

Went through verification using the following build under Win 10 x64 - PASSED

Brave	0.55.17 Chromium: 70.0.3538.67 (Official Build) (64-bit)
Revision	9ab0cfab84ded083718d3a4ff830726efd38869f-refs/branch-heads/3538@{#1002}
OS	Windows

Verification Passed on

Brave	0.55.17 Chromium: 70.0.3538.67 (Official Build) (64-bit)
Revision	9ab0cfab84ded083718d3a4ff830726efd38869f-refs/branch-heads/3538@{#1002}
OS	Linux