The CalDAV server returns ISO 8601 durations without the T separator for
date-based periods (e.g. -P1D for 1 day, -P2D for 2 days, -P1W for
1 week). The existing translation keys used -PT1D/-PT2D/-PT1W which only
matched the time-based format. This caused raw keys like
"event.form.notifications.-P1D" to appear in the event preview
notification line.
Adds -P1D, -P2D, and -P1W translation keys to all four locale files
(en, fr, ru, vi) alongside the existing -PT variants.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>