Added new resource strings (prefix, link, suffix) for authenticator app setup instructions in German, English, and French resource files. Updated EnvelopeLocked.cshtml to assemble the instruction dynamically using these localized parts, ensuring correct grammar and flexibility across supported languages.
Added "DocumentSharingPeriodExpired" and "Expired" keys to de-DE, en-US, and fr-FR resource files. Updated EnvelopeExpired.cshtml to use localized strings for the title, heading, and message, enabling full internationalization of the expired envelope page.
Refactored Culture model to use required and non-nullable properties.
Removed nullable checks for Info in ShowEnvelope.cshtml.
Changed DI from Cultures to MultiCulture in _ViewImports.cshtml.
A "Refresh" button with a counterclockwise arrow icon is now shown in the envelope UI, but only when the envelope is not in read-only mode. The button uses standard styling classes for consistency.
