Add form checks

[ginolhac]

Installed flask and running went absolutely fine!

I am suggesting to add checks for the forms, that email must be xxx@xxx.xx pythin must have some regex all ready for this. Same for phone numbers, must be numbers.

For Hausnummer and Postleitzuel you check it, must be numbers :+1:

[maximesunnen]

Solved with 0d8254f787c481d4b876b232480f5d276717a31c in wtform-test branch. Not merged yet.

[maximesunnen]

Merge completed

[ginolhac]

awesome! quel boulot ;)