Sync string update

[rossmoody]

Need to update the body copy in the modal for "I have a sync code". Should read: Type your supplied sync chain code words into the form below.

[LaurenWags]

@rossmoody - just to confirm, is the only string updated the one from the description? If there are others, can you add a test plan so we know which ones changed?

[rossmoody]

Yeah, just the description update, and it's not a change, just a string we missed copying over to match the spec during the locale migration from Brave UI. Here's the spec to check against: https://docs.google.com/document/d/1gvOwHRORwg3xDQEUsWRp_WgYC0_TYc87By8v8r0isYM/edit

[GeetaSarvadnya]

Verification passed on

Brave	0.59.25 Chromium: 72.0.3626.53 (Official Build) beta (64-bit)
Revision	98434e6cd182d68ce396daa92e9c6310422e6763-refs/branch-heads/3626@{#620}
OS	Windows 10

• Verified the updated description Type your supplied sync chain code words into the form below display in Enter a sync code popup

Verification passed on

Brave	0.59.25 Chromium: 72.0.3626.53 (Official Build) beta (64-bit)
Revision	98434e6cd182d68ce396daa92e9c6310422e6763-refs/branch-heads/3626@{#620}
OS	Linux

Verification PASSED on macOS 10.14.2 x64 using the following build:

Brave	0.59.28 Chromium: 72.0.3626.64 (Official Build) beta(64-bit)
Revision	eaa9668e80ce5405e7f1902579558ea725c06ca1-refs/branch-heads/3626@{#708}
OS	Mac OS X