Primary email cannot be activated when ‘RegisterEmailConfirm’ is enabled

[Meano]

• Gitea version (or commit ref): 1.15.0+dev-549-gbc6f060b8

• Git version: 2.30.2

• Operating system:

  Ubuntu 21.04 & Windows 10
  Both the official version and the version compiled by myself have been tested.
  I am running gitea from systemd(247.3-3ubuntu3.1) or WinSW(3.0.0).

• Database (use [x]):

  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite

• Can you reproduce the bug at https://try.gitea.io:

  • Yes (/user/settings/account /admin/emails)
  • No

• Log gist:

It fired an error when a new user who signed up without primary mail activated click the Send Activation button.

Send activation: email not set for activation

Description

1. When RegisterEmailConfirm is enabled, the primary email should be activated together with the user account. Otherwise, the primary email can not be activated for the Send Activation not work, and the admin can not activate the user email either.
2. There is some invalid params in email template since Localize Email Templates #16200. Like %!(EXTRA string=xxx, string=Gitea: Git with a cup of tea)
3. I guess the i18n: mail.activate_account.test_x might be a typo, maybe mail.activate_account.text_x?

I have fixed the errors above. Could I create a PR?
main...Meano:develop

Screenshots