chore(client): Add a bounced email string placeholder.
chore(client): Add a bounced email string placeholder.

* `Your verification email was just returned. Mistyped email? Start over.`

This is a placeholder for string extraction until the full PR can be implemented.

issue #1801

atiqueahmedziad/fxa-content-server,TDA/fxa-two-factor-auth,vladikoff/fxa-content-server,chilts/fxa-content-server,swatilk/fxa-content-server,riadhchtara/fxa-content-server,npestana/fxa-content-server,TDA/fxa-two-factor-auth,swatilk/fxa-content-server,npestana/fxa-content-server,ReachingOut/fxa-content-server,jpetto/fxa-content-server,shane-tomlinson/fxa-content-server,riadhchtara/fxa-content-server,ReachingOut/fxa-content-server,atiqueahmedziad/fxa-content-server,mozilla/fxa-content-server,dannycoates/fxa-content-server,ofer43211/fxa-content-server,TDA/fxa-content-server,shane-tomlinson/fxa-content-server,chilts/fxa-content-server,npestana/fxa-content-server,jrgm/fxa-content-server,riadhchtara/fxa-password-manager,jpetto/fxa-content-server,mozilla/fxa-content-server,riadhchtara/fxa-password-manager,vladikoff/fxa-content-server,vladikoff/fxa-content-server,atiqueahmedziad/fxa-content-server,chilts/fxa-content-server,TDA/fxa-two-factor-auth,shane-tomlinson/fxa-content-server,jpetto/fxa-content-server,TDA/fxa-content-server,ofer43211/fxa-content-server,jrgm/fxa-content-server,dannycoates/fxa-content-server,ofer43211/fxa-content-server,ReachingOut/fxa-content-server,dannycoates/fxa-content-server,TDA/fxa-content-server,riadhchtara/fxa-password-manager,riadhchtara/fxa-content-server,swatilk/fxa-content-server,mozilla/fxa-content-server