Expanded the message a user may get when his credentials do not work.
Expanded the message a user may get when his credentials do not work.

tonicospinelli/firefly-iii,JC5/firefly-iii,firefly-iii/firefly-iii,tonicospinelli/firefly-iii,tonicospinelli/firefly-iii,JC5/firefly-iii,firefly-iii/firefly-iii,firefly-iii/firefly-iii,tonicospinelli/firefly-iii,firefly-iii/firefly-iii