Updated next payment display for once offers

[sagzy]

ref https://linear.app/ghost/issue/FEA-547

• Changed displayed label for once offers from "$5/month - Next payment" to "$5 - Next payment", following how Stripe renders the discounted price for once offers
• Also added the corresponding i18n key

[coderabbitai]

Walkthrough

Adds an internal helper getOfferLabel({nextPayment}) to compute translated offer labels (handles discount.duration: forever, once, repeating with end date) and updates PaidAccountActions to use it. Adjusts unit tests to expect the new label/price formatting. Inserts a new "Next payment" translation key (empty value) across many portal locale JSON files. Bumps apps/portal/package.json version from 2.58.0 to 2.58.1. No exported API signatures were changed.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Suggested reviewers

• aileen
• 9larsons

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: updating the display format for next payment labels in once offers by removing the interval.
Description check	✅ Passed	The description accurately explains the changes made, including the specific format change for once offers and the addition of i18n keys, with reference to the related issue.

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✨ Finishing touches

• 📝 Generate docstrings

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@ghost/i18n/locales/de-CH/portal.json`:
- Around line 121-122: The JSON entry for the "Next payment" key currently has
an empty string; replace that empty value with the Swiss German translation
"Nächste Zahlung" so the de-CH locale shows a proper label (update the JSON
value for the "Next payment" key in portal.json accordingly).

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

Provide a de-CH translation instead of an empty string.

An empty value will likely display a blank label for German (Switzerland) users. Consider translating to “Nächste Zahlung” (Swiss German spelling uses no ß).

💡 Suggested translation

-    "Next payment": "",
+    "Next payment": "Nächste Zahlung",

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

	"Newsletters can be disabled on your account for two reasons: A previous email was marked as spam, or attempting to send an email resulted in a permanent failure (bounce).": "Newsletter können aus zwei Gründen in Ihrem Konto deaktiviert werden: Eine frühere E-Mail wurde als Spam markiert oder der Versuch, eine E-Mail zu senden, führte zu einem dauerhaften Fehler (Bounce).",
	"Next payment": "",
	"Newsletters can be disabled on your account for two reasons: A previous email was marked as spam, or attempting to send an email resulted in a permanent failure (bounce).": "Newsletter können aus zwei Gründen in Ihrem Konto deaktiviert werden: Eine frühere E-Mail wurde als Spam markiert oder der Versuch, eine E-Mail zu senden, führte zu einem dauerhaften Fehler (Bounce).",
	"Next payment": "Nächste Zahlung",

🤖 Prompt for AI Agents

In `@ghost/i18n/locales/de-CH/portal.json` around lines 121 - 122, The JSON entry
for the "Next payment" key currently has an empty string; replace that empty
value with the Swiss German translation "Nächste Zahlung" so the de-CH locale
shows a proper label (update the JSON value for the "Next payment" key in
portal.json accordingly).