[MM-39299] Remove outdated translations and update go-i18n library (#18674)

* Remove outdated translations

* update go-i18n dependency

* reflect review comments

* add message count for languages which has two translations for plurals

app/email/email_batching.go

@@ -328,7 +328,7 @@ func (es *Service) sendBatchedEmailNotification(userID string, notifications []*
 
 	data := es.NewEmailTemplateData(user.Locale)
 	data.Props["SiteURL"] = siteURL
-	data.Props["Title"] = translateFunc("api.email_batching.send_batched_email_notification.title")
+	data.Props["Title"] = translateFunc("api.email_batching.send_batched_email_notification.title", len(notifications)-1)
 	data.Props["SubTitle"] = translateFunc("api.email_batching.send_batched_email_notification.subTitle")
 	data.Props["Button"] = translateFunc("api.email_batching.send_batched_email_notification.button")
 	data.Props["ButtonURL"] = siteURL