Confirm notifications exist and are triggered correctly

[benperlman]

in lib> string.js

Notifications:
1 week before: We’re so excited you’ve joined iWalk! The walking challenge starts next Wed, July 1st. Get ready to walk!
1 day before: Get your walking shoes on! The walking challenge starts tomorrow, July 1st! Remember, your total step count will be reset to zero tomorrow to kick-off the challenge.
At end of first week: Congratulations on finishing your first week. You took ### steps this week! Keep it up!
If user hasn’t opened app in 5 days: Looks like you haven’t opened the iWalk app in a few days and we miss you! Open up the app to see your step progress!
At beginning of last week: Only one week left! Keep up the great walking.
On last day: Today is the last day of the walking challenge! You can keep using the app to track your steps even after the program ends. The top walkers will be contacted by email to claim their prize!
If recording has been running for 1 hour: After 1 hour: “You’ve been walking for 1 hour. Don’t forget to stop your walk recording if you’re done!”
If recording has been running for 2 hours: After 2 hours: “You’ve been walking for 2 hours. Your walk recording will automatically stop in 30 minutes.”