Add more descriptive error on forgot password page (#26848)

## Changes
- Forces flashed error to render immediately when forgot password code
is incorrect or has expired.
- Adds a link back to the `forgot_password` page so that the user can
restart the process (in the event that their link has expired)

templates/user/auth/reset_passwd.tmpl

@@ -57,7 +57,7 @@
 							{{end}}
 						</div>
 					{{else}}
-						<p class="center">{{.locale.Tr "auth.invalid_code"}}</p>
+						<p class="center">{{.locale.Tr "auth.invalid_code_forgot_password" (printf "%s/user/forgot_password" AppSubUrl) | Str2html}}</p>
 					{{end}}
 				</div>
 			</form>