fix: Czech backup notification plural

[jvsena42]

This PR fixes the Czech backup-failure notification so its retry countdown renders correctly instead of leaking raw placeholder text.

Description

The Czech translation of settings__backup__failed_message used a translated word (dalších) where ICU plural syntax requires the literal other keyword. On iOS this string is formatted by the app's lenient regex-based plural helper rather than a strict ICU parser, so the malformed pattern does not crash the app (unlike the equivalent Android bug in synonymdev/bitkit-android#1080). Instead the regex simply fails to match, and Czech users see the raw pattern — {interval, plural, one {# minute} dalších {# minutes}} — literally in the backup-failure toast.

This corrects the Czech string to use the valid other keyword. An audit of all 13 locale string files confirmed this was the only malformed plural entry; every other plural already uses valid keywords, and Italian (which was also broken on Android) was already correct here.

Note: translations are synced from Transifex, so the same correction should also land upstream to avoid a future sync reintroducing it.

Linked Issues/Tasks

Related Android fix: synonymdev/bitkit-android#1080

QA Notes

Manual Tests

• 1. Device language set to Czech → trigger a backup-failure notification (failed backup detected on periodic check): the toast shows the localized "Opakovaný pokus za N minut" retry message, not the raw {interval, plural, ...} placeholder.
• 2. regression: Device language set to English → trigger the same backup-failure notification: toast still shows "Retrying in N minute(s)" correctly.

Automated Checks

• N/A — translation-only string fix; validated by reading the corrected pattern against the plural regex in LocalizeHelpers.swift.

[greptile-apps]

Greptile Summary

This PR fixes the Czech backup-failure countdown text. The main changes are:

• Replaces the malformed plural branch with the supported other keyword.
• Adds a changelog entry for the localization fix.

Confidence Score: 5/5

This looks safe to merge.

• The corrected pattern matches the plural formatter's expected syntax.
• The backup notification supplies the required interval argument.
• No blocking issues were found in the changed code.

Important Files Changed

Filename	Overview
Bitkit/Resources/Localization/cs.lproj/Localizable.strings	Updates the Czech plural pattern to match the formatter's supported one and other syntax.
changelog.d/next/cs-backup-plural.fixed.md	Adds an accurate release note for the corrected Czech notification.

_{Reviews (1): Last reviewed commit: "chore: rename changelog fragment" | Re-trigger Greptile}

[chatgpt-codex-connector]

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[piotr-iohk]

LGTM