Add FXIOS-10524 [Sent from Firefox] Update strings for changed copy

:scroll: Tickets

There was a change to the copy messaging.

You have to check all boxes before merging

[x] Filled in the above information (tickets numbers and description of your work)
[x] Updated the PR name to follow our PR naming guidelines
[ ] Wrote unit tests and/or ensured the tests suite is passing
[ ] When working on UI, I checked and implemented accessibility (minimum Dynamic Text and VoiceOver)
[ ] If needed, I updated documentation / comments for complex code and public methods
[ ] If needed, added a backport comment (example @Mergifyio backport release/v120)

	Messages
:book:	Edited 1 files
:book:	Created 0 files