subscriptionRenewalReminder-content-charge uses hard-coded English values for subscription interval

[bcolsson]

The recently changed string has subscriptionRenewalReminder-content-charge highlighted an old issue (originally raised in #8889) in subscription renewal reminder emails. The following string has a variable hardcoded in English, so a localized string will display with a mix of English and translated text. The text itself also seems out of date - for example, our strings for subscription plans generally have patterns for daily, weekly, monthly, halfyearly (6-month), and yearly only.

Fluent string:
subscriptionRenewalReminder-content-charge = At that time, { -brand-mozilla } will renew your { $planIntervalCount } { $planInterval } subscription and a charge of { $invoiceTotal } will be applied to the payment method on your account.

For example, the string will display the below Italian:
A quel punto, Mozilla rinnoverà il tuo abbonamento 1 month e verrà applicato un addebito di $20.00 al metodo di pagamento sul tuo account.

We should update the string for proper localization and to match our other subscription plan lengths, for example:

subscriptionRenewalReminder-content-charge-daily = At that time, { -brand-mozilla } will renew your daily subscription and a charge of { $invoiceTotal } will be applied to the payment method on your account.

subscriptionRenewalReminder-content-charge-weekly = At that time, { -brand-mozilla } will renew your weekly subscription and a charge of { $invoiceTotal } will be applied to the payment method on your account.

subscriptionRenewalReminder-content-charge-monthly = At that time, { -brand-mozilla } will renew your monthly subscription and a charge of { $invoiceTotal } will be applied to the payment method on your account.

subscriptionRenewalReminder-content-charge-halfyearly = At that time, { -brand-mozilla } will renew your 6-monthly subscription and a charge of { $invoiceTotal } will be applied to the payment method on your account.

subscriptionRenewalReminder-content-charge-yearly = At that time, { -brand-mozilla } will renew your yearly subscription and a charge of { $invoiceTotal } will be applied to the payment method on your account.

┆Issue is synchronized with this Jira Task