[Phyo branch] Validation, Centralized Nav part 2, update email error and removed chat convo alert

[Phyo09]

Changed the repeated validation to only one for login, registration and forgot password pages. Mainly using html built-in validation.

Improved the error msg sentences on multiple pages (e.g., login, registration, forgot password, modifycenter)

Changed the unmeaningful id's names accordingly. (esp, registration/signup)

Registration page error style is changed to highlight the text with bold and red style. (instead of id, used class)

While changing email, the email can only be updated, if the new email is not exist in the system.

Validation of modifycenter are changed

• JS for PIN is no longer checked password instead its PIN now
• definition of password is changed.

Below templates are completed for this commit and update base.html for Help tab.

• accept_request.html
• answerrequest.html
• change_profile.html (/modifycenter)
• chat_details.html
• confirm_buy.html (/confirmpayment)
• helpcenter.html (Error)
• myrequest.html
• newchat.html
• newrequest.html
• newthread.html
• requestDetail.html
• search_result.html
• thread_details.html (/thread)

Chat Convo alert is removed meaning no more alert when you reply in the chatroom

[xosadmin]

main.db and helpcenter.html caused conflict. Please review and do some modification.