Additional Validations and CSR controllers merge

[stevelaskaridis]

Description

The aim of this PR is to provide some extra validations that were present in accessV1 and merge the different methods of creating a CSR into one controller.

Components

• Maximum length of 254 chars in Person attributes
• Institutional mail check in Person model
• Accept only institutional mails validation is configurable
• Fix for CSR validations
• Fix of discrepancies in browser-created CSR.
• Merge csr_gen controller into CertificateRequests Controller
• Fix locale issue in main page and routes affected.

  Github issues

Addresses issues #81, #86.

[stevelaskaridis]

@NicolasLiampotis, I made the addition we discussed in the current PR. Review this, please.