Add new text for reset password flash (#1718)

* Forgot password should use ResetPwdCodeLives, not ActiveCodeLives
 * Improve documentation for different send mail functions related to password reset
 * Improve documentation in conf/app.ini regarding xxx_CODE_LIVE_MINUTES settings

conf/app.ini

 BLACKLISTED_URIS =
 
 [service]
+; Time limit to confirm account/email registration (in multiples of 60 minutes)
 ACTIVE_CODE_LIVE_MINUTES = 180
+; Time limit to confirm forgot password reset process (in multiples of 60 minutes)
 RESET_PASSWD_CODE_LIVE_MINUTES = 180
 ; User need to confirm e-mail for registration
 REGISTER_EMAIL_CONFIRM = false

models/mail.go

 	mailer.SendAsync(msg)
 }
 
-// SendActivateAccountMail sends an activation mail to the user
+// SendActivateAccountMail sends an activation mail to the user (new user registration)
 func SendActivateAccountMail(c *macaron.Context, u *User) {
 	SendUserMail(c, u, mailAuthActivate, u.GenerateActivateCode(), c.Tr("mail.activate_account"), "activate account")
 }
 	SendUserMail(c, u, mailAuthResetPassword, u.GenerateActivateCode(), c.Tr("mail.reset_password"), "reset password")
 }
 
-// SendActivateEmailMail sends confirmation email.
+// SendActivateEmailMail sends confirmation email to confirm new email address
 func SendActivateEmailMail(c *macaron.Context, u *User, email *EmailAddress) {
 	data := map[string]interface{}{
 		"Username":        u.DisplayName(),

options/locale/locale_en-US.ini

 forgot_password = Forgot password?
 sign_up_now = Need an account? Sign up now.
 confirmation_mail_sent_prompt = A new confirmation email has been sent to <b>%s</b>. Please check your inbox within the next %d hours to complete the registration process.
+reset_password_mail_sent_prompt = A confirmation email has been sent to <b>%s</b>. Please check your inbox within the next %d hours to complete the password reset process.
 active_your_account = Activate Your Account
 prohibit_login = Login Prohibited
 prohibit_login_desc = Your account is prohibited to login, please contact the site administrator.

routers/user/auth.go

 	u, err := models.GetUserByEmail(email)
 	if err != nil {
 		if models.IsErrUserNotExist(err) {
-			ctx.Data["Hours"] = setting.Service.ActiveCodeLives / 60
+			ctx.Data["Hours"] = setting.Service.ResetPwdCodeLives / 60
 			ctx.Data["IsResetSent"] = true
 			ctx.HTML(200, tplForgotPassword)
 			return
 		log.Error(4, "Set cache(MailResendLimit) fail: %v", err)
 	}
 
-	ctx.Data["Hours"] = setting.Service.ActiveCodeLives / 60
+	ctx.Data["Hours"] = setting.Service.ResetPwdCodeLives / 60
 	ctx.Data["IsResetSent"] = true
 	ctx.HTML(200, tplForgotPassword)
 }

templates/user/auth/forgot_passwd.tmpl

 				<div class="ui attached segment">
 					{{template "base/alert" .}}
 					{{if .IsResetSent}}
-						<p>{{.i18n.Tr "auth.confirmation_mail_sent_prompt" .Email .Hours | Str2html}}</p>
+						<p>{{.i18n.Tr "auth.reset_password_mail_sent_prompt" .Email .Hours | Str2html}}</p>
 					{{else if .IsResetRequest}}
 						<div class="required inline field {{if .Err_Email}}error{{end}}">
 							<label for="email">{{.i18n.Tr "email"}}</label>