No pop-up or any feedback for the user when the file is too big or not pdf (only debug messages in the dev console)

[ZuleykhaPavlichenkova-TomTom]

Steps:

1. Open Inspector -> Network
2. Try to submit a .pdf bigger that 5 Mb to the /apply/ and look at the Inspector

Expected result:
Pop-up or other user interaction with the instructions

Actual result:
No instructions - only debug messages in the dev console

[ZuleykhaPavlichenkova-TomTom]

@frontend