edited terms & condition feature

[sunilsabatp]

Fixes #

Changes in this pull request:

• added feature of Terms and condition system on the complete sign up page
  -created a new state for term and condition
  -the user cannot create account without accepting terms and condition

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[mariahosfeld]

@sunilsabatp Please also include the German translations of the new text components, at the moment it is only in English (same for the error message, not included in the screenshot).

[norbertschuler]

• The red error message already gets displayed when you switch e.g. the private account checkbox:

[norbertschuler]

• And after registration a red error popped up - the API call POST https://app-staging.plant-for-the-planet.org/app/profile to register the user replied with an 400 error not doing the registration correctly, but the frontend also does not react on the 400 error correctly as well:

{"code":400,"message":"Validation Failed","errors":{"errors":
   ["Dieses Formular sollte keine zus\u00e4tzlichen Felder enthalten.","","Extra fields: terms"],
"children":{"type":{},"oAuthAccessToken":{},"name":{},"gender":{},"title":{},"firstname":{},"lastname":{},"address":{},"zipCode":{},"city":{},"country":{},"isPrivate":{},"getNews":{},"currency":{},"locale":{},"url":{},"urlText":{},"bio":{},"target":{},"imageFile":{},"tin":{},"mayContact":{}}}}

[norbertschuler]

Please fix the errors first (either we need backend support for the new terms field or we should not send it with the API request, but then a hack could register without accepting the terms).

[sagararyal]

Please implement interpolation of translation key, so multiple translation keys aren't added for one sentence.

[norbertschuler]

Please implement interpolation of translation key, so multiple translation keys aren't added for one sentence.

@sagararyal I added a usage of the Trans component from react-i18next: https://react.i18next.com/latest/trans-component.