Add Danish (da) translations — resolves merge conflicts from PR #1609 (#1612)

* Initial plan

* Add Danish (da) translations from PR #1609

Resolves merge conflicts from PR #1609 by adding Danish translations to the
Localizable.xcstrings file. The PR adds Danish translation strings throughout
the app while preserving all existing translations for other languages.

Co-authored-by: garthvh <1795163+garthvh@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: garthvh <1795163+garthvh@users.noreply.github.com>

Author: Copilot