Sign up input not constrained (user)

[MarwanOSayed]

Severity (low)
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Reported by: Marwan Osama
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Description:
The signup form fields, for service providers and users, have no constraints whatsoever on the input (for instance, age field can take a negative decimal number).
Issue exists in these files/lines:

public/js/signup.component.js
public/partials/signup.template.html

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Steps to reproduce the issue:

1. Go to homepage (/#/home)
2. Click on "user"
3. Click on "click To signup"
4. Click on "click To signup"
5. Write any random data in any field
6. Click on "Sign up"

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Expected result:
Inability to click on "Sign up", a warning message before clicking or a failure message after clicking.